1
                                                               EXHIBIT 10.27



                             DISTRIBUTION AGREEMENT

                                     between

                         CALYPTE BIOMEDICAL CORPORATION

                                       and
                         OTSUKA PHARMACEUTICAL CO., LTD.
   2
                                TABLE OF CONTENTS


                                                                       Page No.
                                                                       --------

                                                                    
1.    DEFINITIONS ....................................................     1
2.    GRANT OF RIGHTS ................................................     5

      2.1  Distribution Rights .......................................     5
      2.2  Affiliates and Subdistributors ............................     6
      2.3  Additional Products .......................................     6

           2.3.1      Rights to Additional Products ..................     6
           2.3.2      Development Agreement for New Products .........     9
           2.3.3      Product Deletions ..............................    10

      2.4  GMP Procedures License ....................................    10
      2.5  Option to Sublicense ......................................    15

3.    SUPPLY; PRICE; SHIPMENT; ACCEPTANCE ............................    15

      3.1  Product ...................................................    15
      3.2  Price .....................................................    16

           3.2.1      Commercial Test ................................    16
           3.2.2      Development Samples ............................    17
           3.2.3      Promotional Samples ............................    17
           3.2.4      Per Test Pricing ...............................    17
           3.2.5      Price Changes ..................................    18
           3.2.6      Taxes ..........................................    18

      3.3  Forecasts, Orders and Acceptance ..........................    19
      3.4  Capacity  Commitment ......................................    21
      3.5  Allocation ................................................    22
      3.6  Payment Terms .............................................    22
      3.7  Credit for Previous Payment ...............................    23
      3.8  Most Favored Customer .....................................    24
      3.9  Delivery ..................................................    25
      3.10 Shipment ..................................................    25
      3.11 Acceptance ................................................    26
      3.12 Reservation of Title ......................................    28
      3.13 Packaging .................................................    28

4.    SPECIAL OBLIGATIONS OF EXCLUSIVE DISTRIBUTOR ...................    29

      4.1  Minimum Annual Payments/Purchases .........................    29
      4.2  Promotion of the Products .................................    32
      4.3  Competing Products ........................................    32
      4.4  Customer Support ..........................................    32
      4.5  Commercially Reasonable Efforts ...........................    33


                                       i
   3

                                                                      
S.    ENFORCEMENT OF CERTAIN RIGHTS ..................................     33

      5.1 Sale of EL System ..........................................     33
      5.2 Third-Party Intellectual Property Rights ...................     34
      5.3 Enforcement of Calypte Patent Rights and Calypte
          Technology in the Otsuka Territory .........................     35
      5.4 Reduction of Payments ......................................     36

6.    REPRESENTATIONS, WARRANTIES AND INDEMNIFICATION ................     38

      6.1 Representations and warranties .............................     38
      6.2 Product Limited Warranty ...................................     41
      6.3 Limitation .................................................     42
      6.4 Indemnification ............................................     43
      6.5 Intellectual Property Infringement Indemnity ...............     44
      6.6 Products Liability Indemnity ...............................     47

7.    CONFIDENTIALITY ................................................     47

      7.1 Confidential Information ...................................     47
      7.2 Confidentiality of Agreement ...............................     49
      7.3 Exceptions .................................................     49
      7.4 Remedies ...................................................     50

8.    LIMITATION OF LIABILITY ........................................     51
9.    TRADEMARKS AND TRADE NAMES .....................................     51

      9.1 Use . . . ..................................................     51
      9.2 Approval Representations ...................................     52

10.   REGULATORY APPROVALS ...........................................     52

      10.1 Obtainment of Approvals ...................................     52
      10.2 Reasonable Diligence ......................................     53
      10.3 PLA Countries .............................................     54
      10.4 Separate Filing Countries .................................     55
      10.5 Extension of Time Periods .................................     56
      10.6 Assignment Upon Termination ...............................     56

11. TERM AND TERMINATION .............................................     57
      11.1 Term ......................................................     57
      11.2 Termination for Convenience ...............................     57
      11.3 Termination for Cause .....................................     58
      11.4 Termination for Bankruptcy ................................     59
      11.5 Effect of Termination .....................................     59
      11.6 No Liability For Expiration or Termination ................     59
      11.7 Survival ..................................................     60
      11.8 Abandonment ...............................................     60


                                       ii
   4


                                                                     
12.   GENERAL PROVISIONS .............................................    61

      12.1   Currency ................................................    61
      12.2   Language ................................................    61
      12.3   Governing Law ...........................................    62
      12.4   Jurisdiction ............................................    62
      12.5   Arbitration .............................................    62
      12.6   Force Majeure ...........................................    63
      12.7   Assignment ..............................................    64
      12.8   No Third-Party Beneficiaries ............................    64
      12.9   Bankruptcy Code .........................................    64
      12.10  Modifications ...........................................    65
      12.11  Notices .................................................    65
      12.12  Descriptive Headings ....................................    66
      12.13  Entire Agreement ........................................    66
      12.14  Severability ............................................    66
      12.15  Legal Expenses ..........................................    66
      12.16  Counterparts ............................................    67
      12.17  Import & Export Controls ................................    67
      12.18  Independent Contractors .................................    68
      12.19  Manufacture in Japan ....................................    68


Exhibit     A    Patents and Patent Applications
Exhibit     B    El System
Exhibit     C    GMP Procedures
Exhibit     D    Escrow Agreement
Exhibit     E    Specifications
Exhibit     F    Manufacturing Capacity
   5
                             DISTRIBUTION AGREEMENT

THIS AGREEMENT, including the attached Exhibits ("Agreement"), executed as of
August 7, 1994 ("Effective Date"), is made and entered into by and between
CALYPTE BIOMEDICAL CORPORATION, a California corporation with principal offices
at 1440 Fourth Street, Berkeley, California Section 94710, United States of
America, ("Calypte") and OTSUKA PHARMACEUTICAL CO., LTD., a corporation
organized under the laws of Japan with principal offices at 2-9, Kanda
Tsukasa-cho, Chiyoda-ku, Tokyo, Japan ("Otsuka").

WHEREAS, Calypte has developed and holds certain rights relating to the Products
(as defined below), and continues to develop new products, which may become
Products within the scope of this Agreement; and

WHEREAS, Otsuka desires to be appointed as Calypte's exclusive distributor for
the Products in the Otsuka Territory, and Calypte is willing to grant Otsuka
such appointment pursuant to the terms and conditions set forth in this
Agreement; and

WHEREAS, Otsuka desires to purchase, and Calypte desires to supply, Otsuka's
requirements for the Products under the terms and conditions of this Agreement.

NOW, THEREFORE, in consideration of the mutual covenants, and subject to the
terms and conditions contained herein, the parties agree as follows:

1.      DEFINITIONS

1.1      "Affiliate" shall mean any person, firm or corporation which controls,
         is controlled by or is under common control with Otsuka. For purposes
         of this Section 1.1,

                                       1
   6
         "control" shall mean ownership, directly or indirectly, of fifty
         percent (50%) or more of the voting stock of the subject party.

1.2      "Calypte Patent Rights" shall mean all United States and foreign
         letters patent and applications for letters patent, industrial models,
         industrial designs, utility models, certificates of invention, and
         other indicia of invention ownership, including any such rights granted
         upon any reissue, division, continuation or continuation-in-part
         applications now or hereafter filed, which are reasonably necessary for
         the design, development, manufacture, sale or use of diagnostic test
         kits for the detection of antibodies to HIV in any bodily fluids, and
         other Products hereunder, which are owned or controlled by or licensed
         to Calypte during the term of this Agreement, including, without
         limitation, the patents and patent applications listed in Exhibit A.

1.3      "Calypte Technology" shall mean all technologies, technical knowledge,
         procedures, processes, designs, inventions, discoveries, know-how,
         show-how, documentation and other works of authorship and any other
         information which is reasonably necessary for the design, development,
         manufacture, use and sale of the Products, together with all
         copyrights, trade secret rights and other intellectual property rights,
         other than Calypte Patent Rights.

1.4      "Competing Product" shall mean any product which tests for the presence
         of antibodies to HIV in any non-blood bodily fluid, and which directly
         competes in the same market niche with, and is a functional substitute
         for, a Product, other than tests used for confirmation purposes (as an
         example, a product would be a Competing Product with the initial test
         Kit, described in Section 1.9(a), if it

                                        2
   7
         tested for the presence of HIV in urine or any other nonblood bodily
         fluid and used multi-test plate and the E1A method and was functionally
         equivalent to the initial test Kit competing in the same market niche).

1.5      "E1 System" shall mean the E1 System and procedures for use as further
         described in Exhibit B attached hereto.

1.6      "GMP Procedures" shall mean the proprietary good manufacturing
         practices and procedures relating to the manufacture of the Products as
         specified by document title or number in Exhibit C, and such other
         information, including names and addresses of suppliers, as shall be
         necessary to permit and enable Otsuka or Affiliates, without need for
         additional information, to manufacture the Products. As used throughout
         this Agreement, GMP Procedures shall mean the then-most current
         procedures and other information relating to the manufacture of the
         Products at any given time.

1.7      "HIV Urine Kit" shall mean any product which includes tests for the
         presence of antibodies to HIV in urine (including products combining
         tests for HIV with tests for other diseases or conditions as well.)

1.8      "0tsuka Territory" shall mean Japan, North Korea, South Korea,
         Republic of China, People's Republic of China, Hong Kong, Thailand,
         Philippines, Indonesia, New Zealand, Australia, Singapore, Malaysia,
         India, Pakistan, Bangladesh, Sri Lanka, Myanmar, Kampuchea, Vietnam,
         Laos, Nepal, Bhutan and Mongolia. "Country" shall mean each Country
         within the Otsuka Territory.

1.9      "Product(s)" shall mean (a) the test kits for the detection of
         antibodies to HIV-1 in urine manufactured and

                                       3
   8
         sold by or on behalf of Calypte known, as of the Effective Date, as the
         Urine HIV-1 EIA Kit or the HIV-1 EIA 96-Well Kit, as further described
         in the SPECIFICATIONS set forth in Exhibit E attached hereto; (b)
         similar test kits for the detection of antibodies to HIV-1, HIV-2 and
         all other strains of HIV in any bodily fluid(s), including combination
         kits testing multiple bodily fluids for multiple strains of HIV (as
         used throughout this Agreement, the term "bodily fluid" includes,
         without limitation, urine, serum, saliva and vaginal washes); (c) all
         improvements and modifications to the kits described in (a) and (b)
         above and new configurations thereof, during the term of this
         Agreement; (d) any products that can reasonably be deemed replacements
         for or successors to such kits which Calypte (including its successors
         and assigns) may introduce during the term of this Agreement; and (e)
         additional products eligible to be included within the definition of
         "Products" in accordance with Section 2.3, and all improvements and
         modifications thereto, new configurations thereof, and replacements for
         or successors to such additional products during the term of this
         Agreement. As tests are added within the definition of "Products"
         during the term of this Agreement, the parties shall discuss in good
         faith and agree upon SPECIFICATIONS therefor, which shall govern the
         additional products as the initial SPECIFICATIONS in Exhibit E govern
         the initial test kit.

1.10     "Service(s)" shall mean the conducting of diagnostic testing utilizing
         a Product.

                                        4
   9
2.       GRANT OF RIGHTS

2.1      Distribution Rights.

         Subject to the terms and conditions of this Agreement, Calypte hereby
         appoints Otsuka as its exclusive distributor for the Products in the
         Otsuka Territory and grants to Otsuka the exclusive right, under
         Calypte Patent Rights and/or Calypte Technology, to promote, market,
         use and sell and otherwise distribute the Products (including
         additional products eligible to be included within the definition of
         "Products" in accordance with Section 2.3) and perform Services in
         every Country in the Otsuka Territory (collectively, in this Section
         2.1, "sell and distribute the Products"). For so long as Otsuka's
         rights to a given Product or Products remain exclusive in a given
         country or countries in the Otsuka Territory, Otsuka shall have the
         exclusive right to sell and distribute such Products in such
         country(ies) in the Otsuka Territory, and Calypte will not, nor will it
         grant any third party the right to, promote, market, use, sell or
         distribute any Products (including additional products eligible to be
         included within the definition of "Products" in accordance with Section
         2.3), or perform Services utilizing any such Products, in any such
         country in the Otsuka Territory; provided that, with respect to any
         additional product eligible to be included within the definition of
         "Products" in accordance with Section 2.3, if Otsuka elects not to
         obtain the rights to such additional product in accordance with Section
         2.3, and if Otsuka's rights of negotiation and refusal with respect to
         an additional product under Section 2.3 are exhausted, then this
         section's prohibition of Calypte selling and distributing such specific
         additional product shall terminate.

                                        5
   10
2.2      Affiliates and Subdistributors.

         Subject to the terms and conditions of this Agreement, Otsuka may
         exercise its right to sell and distribute the Products in the Otsuka
         Territory itself or, in its discretion, through Affiliates and through
         non-Affiliate subdistributors, resellers and other third-party
         distributors (such non-Affiliates being collectively defined as
         "Subdistributors"), and Otsuka may exercise its right to perform
         Services in the Otsuka Territory itself or, in its discretion, through
         Affiliates. Otsuka shall be responsible for the due and punctual
         performance of any and all responsibilities under this Agreement as
         applicable to such Affiliates and Subdistributors.

2.3      Additional Products.

         2.3.1     Rights to Additional Products.
                   In addition to the Product(s) defined in Clauses (a)-(d) of
                   Section 1.9 above, to which Otsuka acquires rights in
                   accordance with this Agreement without further negotiation or
                   change in the terms and conditions of this Agreement, Calypte
                   hereby grants to Otsuka -- so long as Otsuka's rights
                   hereunder remain exclusive in Japan -- a right of first
                   refusal and negotiation, as described here, to obtain the
                   exclusive right to promote, market, use, sell and otherwise
                   distribute (collectively, "sell and distribute") in the
                   Otsuka Territory any and all other test product(s) which
                   Calypte may introduce during the term of this Agreement
                   which: (i) are a test of any bodily fluid(s) and which
                   combine a test for HIV with a test for any disease or
                   condition other than HIV (a combination test for different
                   strains of HIV is

                                        6
   11
                   already included at the outset under Section 1.9(a)-(d)); or
                   (ii) include any test of any bodily fluid for any strain of
                   HIV in any format other than those included within the
                   definition of Product(s) in Section 1.9 (a)-(d) (e.g., a
                   single test kit available for home use); and/or (iii) test
                   any bodily fluid for any human endogenous retrovirus.

                   In accordance with the right granted to Otsuka pursuant to
                   this Section 2.3.1, Calypte agrees to offer to Otsuka in
                   writing, and discuss and negotiate in good faith the terms
                   and conditions of, such rights to sell and distribute such
                   additional products in the Otsuka Territory prior to any
                   discussion relating to such rights with a third party. The
                   initial negotiation period with Otsuka shall be a six (6)
                   month period commencing after all of the following have
                   occurred, upon the later to occur of the following: (a)
                   Calypte's development of, or obtaining the rights to, a
                   viable new product as described above; (b) Calypte's
                   provision to Otsuka of sample of such product and related
                   information and data sufficient to enable Otsuka to evaluate
                   the product; and (c) receipt by Otsuka of a written offer
                   from Calypte proposing specific terms and conditions under
                   which Calypte would agree to Otsuka's exclusive distribution
                   of such product in the Otsuka Territory. In the event
                   that Calypte and Otsuka do not reach agreement within such
                   six (6) month period, Calypte shall then have six (6) months
                   beginning on the expiration of such period to enter into an
                   agreement with any third party on

                                        7
   12
                   terms and conditions that are the same as those previously
                   offered to Otsuka or that are more favorable to Calypte than
                   those previously offered to Otsuka. Should Calypte modify the
                   terms and conditions of its offer such that they are more
                   favorable to a distributor (Otsuka or a third party) than
                   those previously rejected by Otsuka, Calypte must first offer
                   such modified terms and conditions to Otsuka in writing, and
                   discuss and negotiate in good faith such modified terms and
                   conditions, prior to offering such modified terms and
                   conditions to a third party. In the event that Calypte and
                   Otsuka do not reach agreement within sixty (60) days after
                   receipt by Otsuka of such proposed modified terms and
                   conditions, Calypte may, during the subsequent sixty (60) day
                   period, offer such modified terms and conditions of agreement
                   to any third party as provided herein and conclude an
                   agreement on such terms and conditions with a third party
                   during such period. If at the end of this cycle, Calypte has
                   reached agreement with no one for the distribution of the new
                   product in the Otsuka Territory, the cycle of procedures in
                   this Section 2.3.1 shall be repeated, beginning with a
                   proposal to Otsuka.

                   If Calypte and Otsuka reach agreement with respect to the
                   right of Otsuka to sell and distribute an additional product
                   in the Otsuka Territory, such additional product shall be
                   included as a "Product" within the scope of this Agreement
                   and all of the parties' rights and obligations under this
                   Agreement with regard to the Product shall also apply to such
                   additional

                                        8
   13
                   Product except to the extent the parties mutually agree
                   otherwise.

         2.3.2     Development Agreement for New Products.
                   Prior to development of a viable new product, if Calypte,has
                   an idea for development of a new product of the type
                   described in Section 2.3.1 (i), (ii) or (iii) above, it shall
                   first offer a proposed development agreement to Otsuka for
                   consideration and shall negotiate the terms and conditions of
                   such development agreement in good faith with Otsuka for up
                   to six (6) months beginning on the date Otsuka receives such
                   proposed agreement. If the parties do not reach agreement on
                   the terms of a development agreement within such six (6)
                   month period, Calypte can enter into a development agreement
                   with a third party during the subsequent six (6) month period
                   on terms and conditions that are the same as those offered to
                   Otsuka or more favorable to Calypte than those offered to
                   Otsuka. If Calypte enters into such an agreement with a third
                   party, and if such agreement grants the third party the
                   rights in the Otsuka Territory to the new product being
                   developed with the third party's funding, Otsuka shall have
                   no further rights of first refusal/negotiation under this
                   Agreement to such new product once it is developed unless the
                   third party waives or does not pursue its rights to such new
                   product. If the third party waives its rights to the new
                   product and Calypte retains the right to distribute such
                   product to 0tsuka, the parties shall follow the cycle of

                                        9
   14
                   proposal and negotiation procedures outlined above in Section
                   2.3.1.

        2.3.3      Product Deletions.

                   If Calypte intends to modify a Product, to introduce a
                   replacement Product or to cease manufacture of a Product
                   hereunder due to a planned replacement thereof, Calypte shall
                   inform Otsuka in writing of such intention at least sixty
                   (60). days prior to Calypte's filing of a submission to the
                   appropriate government authority seeking governmental
                   approval of its manufacture of the modified or replacement
                   Product, and the parties shall discuss in good faith a
                   transition plan for the discontinuance of the Product being
                   modified or replaced; notwithstanding the above, Calypte
                   hereby commits to continue manufacturing and supplying to
                   Otsuka the Product (as improved from time to time through
                   modifications and reconfigurations) unless Calypte introduces
                   a replacement Product reasonably acceptable to Otsuka.

2.4      GMP Procedures License.

         2.4.1     Subject to the terms and conditions of this Agreement and
                   conditioned upon the occurrence of a Releasing Event (as
                   defined in Section 2.4.3 below), Calypte hereby grants to
                   Otsuka a non-exclusive, non-transferable (except to the
                   extent transfer or assignment is permitted under Section
                   12.7) license, with right to sublicense only to Affiliates,
                   to use the GMP Procedures to manufacture or have manufactured
                   the Products and the exclusive right (subject to such right

                                       10
   15
                   becoming non-exclusive as provided elsewhere in this
                   Agreement) to promote, market, use, sell and otherwise
                   distribute such Products in those countries in the Otsuka
                   Territory on the date Otsuka exercises this license.
                   Independent of and in addition to the escrow obligations set
                   forth in Section 2.4.2, Calypte shall, upon the occurrence of
                   a Release Event, immediately provide the then-current version
                   of the GMP Procedures to Otsuka. The entity that actually
                   manufactures the Products may be, in Otsuka's discretion,
                   Otsuka, an Affiliate or a third party acting under contract.
                   The location of the manufacturing facility need not be in the
                   Otsuka Territory, provided the facility is owned by Otsuka or
                   an Affiliate or is approved by Calypte.

         2.4.2     Calypte assures Otsuka that where Calypte is unable or
                   otherwise fails to provide the Products to Otsuka in
                   accordance with the terms of this Agreement, Otsuka may
                   manufacture or have manufactured the Products for use, sale
                   and distribution consistent with Otsuka's rights pursuant to
                   this Agreement. Calypte agrees to place the GMP Procedures
                   into escrow with a third-party escrow agent, and upon terms
                   and conditions reasonably acceptable to both parties as set
                   forth in the Escrow Agreement attached hereto as Exhibit D.
                   Such escrow shall provide for Calypte to place the
                   then-current version of the GMP Procedures into escrow upon
                   the effective date of such escrow, to update such material
                   within sixty (60) days following the earlier of (i) receipt
                   of FDA approval for the

                                       11
   16
                   Product, (ii) receipt of approval to market the Product in
                   Japan from the appropriate Japanese regulatory agencies or
                   (iii) six (6) months following the Effective Date of this
                   Agreement, and then to continue to update such materials at
                   least every three (3) months thereafter. Such escrow shall
                   also provide for the release of the GMP Procedures to Otsuka
                   upon the occurrence of a Releasing Event, and the escrow
                   agent shall promptly and fully release the GMP Procedures to
                   Otsuka upon such occurrence. Otsuka shall be entitled to
                   retain, at Otsuka's expense, a person reasonably acceptable
                   to Calypte to conduct one (1) inspection per calendar year of
                   the deposited GMP Procedures to verify the deposit of the GMP
                   Procedures in accordance with this Agreement and the Escrow
                   Agreement. Otsuka agrees that, prior to inspection of the
                   deposited GMP Procedures, such person shall execute an
                   appropriate confidentiality agreement. Such person shall be
                   given access to the deposited GMP Procedures in the presence
                   of a Calypte representative only and adequate time to review
                   such GMP Procedures; provided, however, that no notes may be
                   taken during such person's inspection of the GMP Procedures.

         2.4.3     For purposes of this Agreement, a "Releasing Event" shall
                   mean that Calypte fails to, or becomes unable to, supply the
                   Products to Otsuka as provided hereunder for any reason,
                   including without limitation, a Force Majeure event, and
                   Calypte has failed to cure such failure within ninety (90)
                   days of the delivery date (as provided in Section 3.3.3).
                   Recognizing that

                                       12
   17
                   the time period between exercise of this license and the
                   beginning of commercial manufacture of the Products could be
                   long, and that continued manufacture of the Products by
                   Calypte would be preferable to licensing new manufacturing
                   facilities and exercising its license under this Section 2.4,
                   Otsuka agrees, in its discretion, to use its reasonable
                   efforts to assist Calypte, at Calypte's expense, in solving
                   the problem that is causing Calypte to be unable to supply
                   the Products to Otsuka hereunder.

         2.4.4     Calypte agrees that -- unless Otsuka elects in writing not to
                   exercise its rights hereunder -- in the event a Releasing
                   Event does occur, Calypte shall immediately release the GMP
                   Procedures to Otsuka and shall not impede the escrow agent's
                   release of same to Otsuka. To the full extent of its right,
                   power and authority, and conditioned only upon the occurrence
                   of a Releasing Event, Calypte hereby grants Otsuka a
                   non-exclusive license and sublicense, with a right to
                   sublicense to its Affiliates, under licenses from Calypte,
                   New York University, Cambridge Biotech and such other
                   licenses as may be necessary or appropriate, to manufacture
                   or have manufactured the Products for use, sale and
                   distribution in the Otsuka Territory. In the event Calypte
                   does not, on the Effective Date of this Agreement, possess
                   the right, power and authority to grant Otsuka all
                   sublicenses from third parties necessary for Otsuka to make
                   the Products upon the occurrence of a Releasing Event,
                   Calypte shall immediately and diligently pursue such

                                       13
   18
                   right, power and authority from such third parties, shall
                   notify Otsuka upon obtaining such right, power and authority,
                   and shall provide Otsuka written verification thereof. This
                   section shall be deemed a present and ongoing grant by
                   Calypte to Otsuka, conditioned upon the occurrence of a
                   Releasing Event, of all licenses and sublicenses necessary
                   for Otsuka, Affiliates and third-party manufacturers to
                   manufacture the Products. Once Otsuka or an Affiliate (or a
                   third-party manufacturer with whom they may contract)
                   commences preparations for the manufacture of the Products,
                   Otsuka and its Affiliates shall not be required by Calypte to
                   give up the rights granted by Calypte to manufacture the
                   Products, even if the Releasing Event shall thereafter be
                   resolved.

         2.4.5     If Otsuka chooses to manufacture or have manufactured the
                   Products under the license and sublicenses granted under
                   Sections 2.4.1 and 2.4.4 above after the occurrence of a
                   Releasing Event, to the extent that such license includes the
                   sublicenses of certain third-party intellectual property
                   rights to Otsuka requiring the payment of royalties to third
                   parties not affiliated with Calypte, Otsuka agrees that it
                   shall pay, directly to such third parties, all royalties due
                   to such third parties related specifically to Otsuka's
                   manufacture, use and sale of the Products. Amounts paid to
                   such third parties shall be deducted from any amounts
                   otherwise payable to Calypte. In addition, if Otsuka chooses
                   to manufacture or have manufactured the Products under the
                   license and

                                       14
   19
                   sublicenses granted under Section 2.4.1 and 2.4.4 after the
                   occurrence of a Releasing Event, and Otsuka elects not to
                   continue purchasing Products manufactured by Calypte, the
                   minimum annual payment/purchase provisions of Section 4.1
                   shall be deemed terminated, though Otsuka's exclusive rights
                   in the Otsuka Territory shall continue.

2.5      Option to Sublicense.

         In addition to the sublicenses from New York University and others
         described in Section 2.4 above relating to the manufacture of Products
         upon the occurrence of a Releasing Event, Calypte agrees that at such
         time as Calypte is obligated, under the terms of its patent license
         with New York University, to negotiate the grant of sublicenses under
         the patents ("NYU Patents") covered by such agreement, Calypte shall
         notify Otsuka and shall, at the request of Otsuka, negotiate in good
         faith the terms under which it would grant Otsuka such sublicense under
         such NYU Patents and use its reasonable and diligent efforts to involve
         New York University in such discussions in an effort to obtain for
         Otsuka exclusive rights under such NYU Patents coequal with the
         exclusivity granted by Calypte to Otsuka hereunder.

3.       SUPPLY; PRICE; SHIPMENT; ACCEPTANCE.

3.1      Product.

         Subject to the terms and conditions of this Agreement, Otsuka shall
         purchase from Calypte, and Calypte shall supply to Otsuka, either
         directly or through a third-party supplier designated by Calypte,
         Otsuka's requirements of the Products. Such supply shall conform to the
         description and specifications of the Products and

                                       15
   20
         material, workmanship, packaging and labeling of the Products as set
         forth in Exhibit E ("SPECIFICATIONS"), as modified from time to time by
         mutual agreement of the parties and as supplemented from time to time
         to add SPECIFICATIONS for additional products that become "Products"
         within the scope of this Agreement during the term hereof. The
         Products supplied by Calypte shall be, manufactured, handled and
         packaged by Calypte or its designee in accordance with all applicable
         laws and regulations. The Products supplied to Otsuka hereunder are for
         Otsuka's (and, in Otsuka's discretion, Affiliates' and
         Subdistributors') promotion, marketing, use, sale and distribution in
         accordance with the terms of this Agreement, and may not be otherwise
         promoted, marketed, used, sold or distributed without Calypte's prior
         written consent.

 3.2 Price.

     3.2.1         Commercial Test.

                   The parties hereby agree that the price to be paid by Otsuka
                   for the Products described in Clauses (a), (b), (c) and (d)
                   of Section 1.9 shall be                             per test,
                   subject to: a volume discount to be discussed in good faith
                   between the parties; lower prices for development and
                   promotional samples as provided in Sections 3.2.2 and 3.2.3
                   below; the "Most Favored Customer" clause of Section 3.8; and
                   price changes as agreed upon in accordance with Section
                   3.2.5.

Confidential portion has been omitted and filed separately with the Commission

                                       16
   21
         3.2.2     Development Samples.

                   At Otsuka's request Calypte shall supply Otsuka with up to
                   two hundred thousand (200,000) tests for development samples
                   of each Product at a price of                           per
                   test. Development samples must be labeled in accordance with
                   applicable regulations. As of the Effective Date of this
                   Agreement Calypte had already provided Otsuka with
                   approximately one hundred thousand (100,000) sample tests of
                   the kit described in Section 1.9(a).

         3.2.3     Promotional Samples.

                   Calypte also agrees to supply Otsuka with promotional samples
                   of the Products, on a country-by-country basis, at a price of
                                                per test. Amounts to be provided
                   by Calypte will be twenty percent (20%) of the first year's
                   sales in respective Countries of the Otsuka Territory and ten
                   percent (10%) of the sales for the second year. At the end of
                   each such year with respect to each Country of the Otsuka
                   Territory, Otsuka shall return all unused promotional samples
                   or, in the case of the first year, credit unused promotional
                   samples against the second year's sales.

         3.2.4     Per Test Pricing.

                   The pricing provided above is quoted on a "per test" basis. A
                   test refers to a single well on multi-well plate together
                   with the associated reagents required to perform a single
                   test.

Confidential portion has been omitted and filed separately with the Commission

                                       17
   22
         3.2.5     Price Changes.

                   The parties agree to renegotiate a higher or lower price in
                   good faith at reasonable intervals upon request when a party
                   believes that market conditions require, but no more often
                   than once per year unless the parties mutually agree
                   otherwise. Such price renegotiations may include reasonable
                   adjustments for inflation, increases or decreases in costs of
                   components or reduction of the NHI price of the Products.

         3.2.6     Taxes.

                   All prices are F.O.B. delivery to the international carrier
                   in California, unless the parties mutually agree otherwise.
                   Prices are exclusive of all sales, use or other similar
                   transaction taxes or duties, if any, imposed directly on the
                   purchase of the Products by Otsuka where applicable law
                   imposes such tax or duty. Any such tax or duty shall be borne
                   by Otsuka. Any tax imposed on the manufacture of the Products
                   by or on behalf of Calypte, and any tax imposed on sales of
                   the Products by Calypte prior to F.O.B. delivery to the
                   international carrier shall be borne by Calypte. When Calypte
                   has the legal obligation to collect taxes or duties on the
                   purchase of the Products by Otsuka, the amount of such taxes
                   and duties shall be added to Calypte's invoice and paid by
                   Otsuka unless Otsuka provides Calypte with a valid tax
                   exemption certificate authorized by the appropriate taxing
                   authority.

                                       18
   23
                   All payments by Otsuka to Calypte shall be subject to any
                   applicable withholding taxes imposed upon such payments.
                   Otsuka agrees to provide to Calypte any and all information
                   relating to such withholding taxes reasonably requested by
                   Calypte in connection with Calypte's obligations to taxing
                   authorities in the United States of America, such information
                   to include, without limitation, official receipts issued to
                   Otsuka by appropriate taxing authorities.

3.3      Forecasts, Orders and Acceptance.

         3.3.1     During the term of this Agreement, on or before the first day
                   of each calendar quarter, Otsuka shall submit to Calypte a
                   rolling forecast showing Otsuka's expected requirements for
                   the Products over the next twelve (12) months.

         3.3.2     The parties agree that in order to protect Calypte's
                   production scheduling and to ensure a smooth source of supply
                   to Otsuka, purchase orders submitted by Otsuka to Calypte for
                   a Product for delivery during the second quarter of any
                   forecast (i.e. months 4, 5 & 6) (i) shall not, unless Calypte
                   agrees otherwise in writing, be for less than eighty percent
                   (80%) of the quantity of such Product forecast for such
                   quarter in the forecast submitted at the beginning of the
                   prior calendar quarter ("Minimum Purchase Commitment"), and
                   (ii) shall be binding upon Calypte, but only to the extent
                   that they do not exceed either (x) one hundred fifty percent
                   (150%) of the quantity of such

                                       19
   24
                   Product forecast for such quarter in the forecast submitted
                   at the beginning of the prior calendar quarter or (y) the
                   Calypte Capacity Commitment (as defined in Section 3.4
                   below). In the event that Otsuka submits purchase orders with
                   respect to a calendar quarter for the purchase of less than
                   the Minimum Purchase Commitment (absent Calypte's agreement
                   to such lesser volume), Otsuka shall be obligated to pay
                   Calypte the purchase price for the number of units by which
                   its orders fall short of such required total. Where Otsuka
                   submits purchase orders for more than one hundred fifty
                   percent (150%) of the quantity forecasted or more than the
                   Calypte Capacity Commitment, Calypte shall use its reasonable
                   efforts to provide the Products in excess of such quantities
                   if requested by Otsuka, but Calypte shall have no obligation
                   to provide such excess quantities and its failure to so
                   provide shall not be a breach of this Agreement.

         3.3.3     All purchases and sales between Calypte and Otsuka will be
                   initiated by Otsuka's issuance of written purchase orders
                   sent via airmail or facsimile. Additionally, Otsuka may
                   initiate purchase orders verbally, provided that it confirms
                   such orders in writing within seven (7) days. Such orders
                   will state unit quantities, unit descriptions, requested
                   delivery dates and shipping instructions, including ship-to
                   locations (which may be to Affiliates or Subdistributors).
                   Calypte shall accept all purchase orders from Otsuka, subject
                   to the limitations of Section 3.3.2. Within ten (10)

                                       20
   25
                   days after its receipt of Otsuka's purchase order, Calypte
                   will send Otsuka its written acknowledgement and acceptance
                   (subject to Section 3.3.2) of such order. Calypte's written
                   acceptance shall include, without limitation, the delivery
                   date. Such delivery date shall be as requested by Otsuka, if
                   reasonably possible, provided that Calypte shall not be in
                   breach of this Agreement if it delivers the ordered Products
                   within the earlier of ninety (90) days after Calypte's
                   written acceptance of Otsuka's purchase order or one hundred
                   (100) days after Calypte's receipt of Otsuka's written
                   purchase order, unless Otsuka and Calypte otherwise agree in
                   writing. The terms and conditions of this Agreement will
                   control all sales of the Products hereunder, and any
                   additional or different terms or conditions in either party's
                   purchase order, acknowledgement or similar document will be
                   of no effect.

3.4      Capacity Commitment.

         For purposes of this Agreement, the "Calypte Capacity Commitment" for a
         Product shall mean one-half (1/2) of Calypte's total manufacturing
         capacity (both Calypte's own manufacturing capacity and the third party
         manufacturing capacity for which Calypte contracts) for each Product
         until the first commercial sale of such Product in Europe, at which
         time the Calypte Capacity Commitment shall be reduced to one-third
         (1/3) of Calypte's total manufacturing capacity. The parties understand
         and acknowledge that Calypte's manufacturing capacity at the time of
         execution of the Agreement, and its future increased capacity, is as
         set forth in Exhibit F attached hereto. Should the parties come to the
         understanding that

                                       21
   26
         the demand for the Products in the Otsuka Territory will come to exceed
         the Calypte Capacity Commitment within a foreseeable period of time,
         they shall meet to discuss in good faith reasonable ways to increase
         Calypte's manufacturing capacity, and Calypte shall use reasonable and
         diligent efforts to increase its manufacturing capacity for the
         Products.

3.5      Allocation.

         In the event that demand for a Product exceeds Calypte's manufacturing
         capacity, Calypte will have the right, at its sole discretion, to
         allocate its capacity between Otsuka and Calypte's other distribution
         channels; provided that in the event of any such allocation, Otsuka
         will receive at least a pro-rata share of available units based upon
         its pro-rata share of the total orders submitted by all of Calypte's
         distribution channels; provided further that in no event will Otsuka
         receive less than the Calypte Capacity Commitment for such Product (as
         provided in Section 3.4 above) if Otsuka orders such amount.

3.6      Payment Terms.

         Upon receipt of Calypte's written acceptance of each and every purchase
         order pursuant to Section 3.3, Otsuka shall pay to Calypte thirty
         percent (30%) of the purchase price due for each such purchase
         order, such payment amount to be (i) paid within ten (10) days of
         Otsuka's receipt of Calypte's written acceptance of Otsuka's purchase
         order and (ii) non-refundable unless Calypte fails to deliver such
         order or except as otherwise provided in Section 3.11. Upon shipment of
         the Products, Calypte will submit an invoice to Otsuka requesting
         payment of the remaining balance due for such shipment. Provided Otsuka
         accepts the shipment in accordance with Section 3.11, Otsuka will make
         payment to Calypte of such balance due

                                       22

   27
           within sixty (60) days from the date on which Otsuka receives the
           invoice or receives the shipment at its facilities or at the
           facilities of the Affiliate or Subdistributor to which Otsuka
           directed the Products to be shipped, whichever is later, unless
           another payment date is agreed to in writing by Calypte and Otsuka.
           In the event the Products are properly manufactured, packaged and
           shipped and in satisfactory condition when Calypte transfers them to
           the international shipper, but are damaged in the course of shipment
           to Otsuka or its designees, Otsuka will nevertheless pay the balance
           due Calypte. All payments shall be made by wire transfer, check or
           other instrument approved by Calypte in United States of America
           Dollars in the requisite amount to a bank account as Calypte may from
           time to time designate. In the event that any payment due Calypte is
           delinquent, interest shall accrue on any overdue amount and be
           charged against Otsuka at the rate of one and one-half percent (1.5%)
           per month or the maximum rate permitted by law, whichever is less.
           Calypte reserves the right to withhold any shipments or its
           performance if Calypte has not been paid in accordance with the terms
           set forth herein; provided that, due to Otsuka's projected need for a
           stable supply of the Products, Calypte shall withhold no shipments or
           other performances if Otsuka disputes whether a payment is due, in
           which case the parties shall resolve such dispute voluntarily or, if
           necessary, through prompt arbitration in accordance with Section
           12.5. Otsuka agrees that after it has accepted shipment in accordance
           with Section 3.11, it shall not dispute that payment is due on such
           shipment.

3.7        Credit for Previous Payment.

           Otsuka has already paid Calypte 
                                  pursuant to the

Confidential portion has been omitted and filed separately with the Commission

                                       23
   28
           License and Supply Agreement of May 10, 1991 (the "License and
           Supply Agreement") between the parties hereto, which amount is
           creditable against other future payments due Calypte pursuant to
           Section 3.1 of the License and Supply Agreement. In exchange for
           Otsuka's agreement here to waive its right to the future
           creditability of such sum, Calypte hereby agrees to discount by fifty
           percent (50%) the price of Product(s) supplied to Otsuka under this
           Agreement until, but only until, Otsuka has received a total discount
           of                                                              under
           this section. At such time as Otsuka has received a discount in such
           amount, there shall be no further discount due under this section.
           Pursuant to Section 11.10 of the License and Supply Agreement, which
           prohibits any modification of its terms or conditions without the
           written consent of the party to be charged, Otsuka hereby agrees, in
           exchange for this discount to be granted by Calypte under this
           Section 3.7, to waive its right to have the 
                                              paid under the License and Supply
           Agreement creditable against other future payments and does hereby
           forgive this sum of Calypte.

3.8        Most Favored Customer.

           Calypte agrees that the financial terms of this Agreement are at
           least as favorable to Otsuka as those provided by Calypte to any
           other distributor for similar or lower volumes under similar
           circumstances, and that in the event that Calypte offers better terms
           to a distributor for similar or lower volumes of the Products under
           similar circumstances, Calypte will promptly offer Otsuka the
           opportunity to substitute such prices and terms for those contained
           in this Agreement (as a whole), effective as of the date such prices
           or terms were first granted to such third party.

Confidential portion has been omitted and filed separately with the Commission

                                       24
   29
3.9        Delivery.

           Calypte will deliver the Products on or before the Delivery date
           specified in Calypte's written acceptance of Otsuka's order, provided
           such date shall be no later than the earlier of ninety (90) days
           after Calypte's written acceptance of Otsuka's order or one hundred
           (100) days after Calypte's receipt of Otsuka's order. Calypte will
           deliver the Products to Otsuka in containers to be selected by
           Calypte, provided that such containers are reasonably acceptance to
           Otsuka.

3.10       Shipment.

           All the Product shipments shall be F.O.B. delivery to the
           international carrier in California (unless the parties mutually
           agree otherwise) and will be by air to the destinations selected by
           Otsuka in its purchase orders, provided U.S. export laws do not
           prohibit Calypte from shipping to such locations. All shipments shall
           be on or before the dates as specified in accordance with Sections
           3.3.3 and 3.9, unless otherwise agreed. Risk of loss will pass to
           Otsuka upon delivery to the international carrier. Unless otherwise
           requested by Otsuka, Calypte shall make all international shipping
           arrangements, including procuring freight insurance, on behalf of
           Otsuka. All international freight insurance and other international
           shipping expenses shall be borne by Otsuka. All international freight
           charges prepaid by Calypte will be reimbursed by Otsuka.
           Notwithstanding the above, in the event that Calypte ships the
           Products to Otsuka from a location other than Calypte's facility in
           Northern California, United States of America, Calypte will bear the
           expense of any shipping and insurance expenses in excess of shipping
           and insurance expenses from Northern California, United States of
           America. Otsuka shall also bear any and all applicable duties,
           customs

                                       25
   30
           brokerage fees and other similar charges that may be assessed against
           the Product shipments to Otsuka upon or after delivery to the
           international carrier in California. Otsuka will be responsible for
           filing freight claims. Calypte will advise Otsuka in advance of all
           necessary information relating to shipment of the Products including,
           without limitation, the identity of the carrier, flight number,
           scheduled arrival time, package identification number, insurance
           information and similar information. Calypte will also provide to
           Otsuka copies of results of Calypte's quality control and product
           release test data for each lot of the Products from which the
           Products were shipped to Otsuka hereunder.

3.11       Acceptance.

           Acceptance by Otsuka of the Products delivered by Calypte hereunder
           shall be subject to inspection and testing by Otsuka or, in Otsuka's
           discretion, by the Affiliate or Subdistributor to which a shipment is
           delivered. In the event that any Product shipment fails to conform
           with the SPECIFICATIONS or is otherwise defective in materials,
           workmanship or packaging, Otsuka (or its designee) shall have the
           right to reject such shipment, provided that (i) rejection is made
           within thirty (30) days after receipt out of customs by Otsuka (or
           its designee) of such Product shipment, and (ii) such Product
           shipment has not been used by Otsuka (or its designee) other than for
           acceptance testing and quality control. The sole criteria
           for rejection by Otsuka of the Product shipments shall be failure of
           the Product shipments to conform with the SPECIFICATIONS or the
           determination that such shipment is otherwise defective in material,
           workmanship or packaging. Calypte and Otsuka acknowledge that the
           SPECIFICATIONS may be modified during the term of this Agreement,
           provided, however that any such modification shall be agreed to in


                                       26
   31
           writing by the parties. Calypte shall provide its then-current test
           protocol used by Calypte to conduct out-going quality assurance
           testing for each Product (which test protocol Calypte and Otsuka
           shall discuss and agree upon) to Otsuka for use by Otsuka and its
           designees in performing their incoming inspection; a copy of such
           test method, current as of the Effective Date of this Agreement, is
           attached hereto as Exhibit E. At Otsuka's reasonable request and
           expense, Calypte will assist Otsuka in developing additional
           acceptance tests for the Products, though Otsuka shall be free to
           develop any acceptance tests it deems appropriate. The Product
           shipments may be rejected by Otsuka only upon written notice by
           Otsuka or its designee to Calypte stating the reason or reasons for
           rejection. Upon confirmation by Calypte that the Products are
           defective, Otsuka shall return or destroy, at Calypte's request, all
           or part of the rejected shipment as the parties shall reasonably
           agree, with all costs of such return to be deducted from the purchase
           price of the Products in that shipment to be paid under Section 3.6.
           If there is any dispute between the parties on the conformity to the
           SPECIFICATIONS or whether a shipment is otherwise defective, then
           such dispute shall be arbitrated in accordance with Section 12.5. At
           no cost to Otsuka (including freight, tax, insurance and duties),
           Calypte shall replace defective Products and redeliver to Otsuka the
           Products within forty-five (45) days after Calypte's receipt of
           Otsuka's (or its designee's) written notice of rejection. In the
           event that Calypte does not replace defective Products with
           acceptable Products within forty-five (45) days of Calypte's receipt
           of Otsuka's written notice of rejection, Calypte shall, at Otsuka's
           option, promptly (i) refund all portions of the purchase price paid
           by Otsuka therefor and reimburse Otsuka for all of Otsuka's

                                       27
   32
           costs incurred in returning the rejected Products to Calypte and for
           the insurance and other shipping expenses paid by Otsuka in
           connection with the initial delivery of the rejected shipment to
           Otsuka, or (ii) credit all such amounts paid by Otsuka against future
           shipments of the Products. The procedures described in this Section
           3.11 in the event of a rejected shipment shall not be deemed to
           constitute a waiver of Otsuka's rights or a postponement of Calypte's
           performance obligations or -- provided Calypte replaces defective
           Product within forty-five (45) days of Otsuka's (or its designee's)
           written notice of rejection -- a Releasing Event.

3.12       Reservation of Title.

           Transfer of title for any and all the Products shipped to Otsuka
           shall be subject to full payment of the purchase price therefor.
           Until such full payment, such Products shall remain the property of
           Calypte. For all the Products delivered to Otsuka (or its designees)
           to which Calypte retains title, Otsuka shall (i) carry full insurance
           and (ii) segregate such Products from other products in Otsuka's
           inventory.

3.13       Packaging.

           All Products supplied by Calypte to Otsuka hereunder will be in the
           form of labeled, standard unit packages utilizing standard labeling
           format and graphics and in a form consistent with the labeling
           requirements for each Country in the Otsuka Territory as agreed upon
           by the parties in writing on a country-by-country basis. Cost of
           normal packaging and labeling of the Product for shipment to Otsuka
           is included in the price of the Product and will be paid by Calypte;
           provided, however, the cost of special packaging and labeling agreed
           to by the parties will be paid by Otsuka.

                                       28
   33
4.         SPECIAL OBLIGATIONS OF EXCLUSIVE DISTRIBUTOR

           So long as Otsuka is the exclusive distributor of the Products in the
           Otsuka Territory:

4.1        Minimum Annual Payments/Purchases.

           Provided Otsuka's rights to distribute the Products in the Otsuka
           Territory remain exclusive during the period described below, and as
           consideration for such exclusive rights, the parties hereby agree to
           the following amounts as minimum annual amounts to be paid or tests
           to be purchased by Otsuka: 



                                                              Minimum Number 
                 Contract Year     Minimum Payment or         of Tests
                 -------------     ------------------         --------------
                                                            
                        1                                                
                        2          U.S.                                  
                        3                                                
                        4                                                
                        5                                                
                        6                                                
                        7                                                
                        8                                                
                        9                                                
                       10                                                


           The applicable minimum amount in a given year shall be the lesser of
           (i) the specified minimum number of tests (in the aggregate) of
           Products purchased by Otsuka, purchased at the then-applicable
           purchase price-per-test-per-Product, or (ii) the dollar amount
           specified above as the minimum payment. Under Section 3.7, the price
           of the first              worth of Products purchased by Otsuka shall
           be discounted by                     until a total discount of
                      has been granted. For purposes of this Section 4.1, such
           discounted amount shall be counted towards satisfying the minimum
           payment amounts specified above (thus, the purchase of products worth
                       , discounted to           , shall be deemed a payment of
                        . In the event Otsuka should lose its

Confidential portion has been omitted and filed separately with the Commission

                                       29
   34
           exclusive right to distribute Products in Japan but retain such
           exclusive rights in other Countries of the Otsuka Territory, the
           minimum annual payments/purchases specified above shall be reduced by
           fifty percent (50%).

           The first Contract Year shall commence on the Date of First Sale (as
           defined below) and end on December 31 immediately thereafter,
           provided that if the Date of First Sale is on or after July 1 of a
           calendar year, the first Contract Year shall end on December 31 of
           the next calendar year. Thereafter, each Contract Year shall consist
           of twelve (12) calendar months beginning on January 1 of each
           calendar year. As used here, the "Date of First Sale" shall be the
           date of Otsuka's first receipt of revenues from the first commercial
           sale of the Products or from the first commercial sale of any Service
           using or incorporating the Products. If the actual amounts paid or
           tests purchased by Otsuka with respect to a given Contract Year are
           less than the lesser of the stipulated minimum amount thereof for
           such Contract Year, Otsuka shall have the option either to pay or
           purchase the balance necessary to bring the amount of payments made
           or tests purchased up to the stipulated minimum amount for such
           Contract Year, thereby maintaining Otsuka's exclusive rights in the
           Otsuka Territory, or not to pay or purchase such additional amount,
           in which case Calypte shall have the right, with written notice to
           Otsuka within the first sixty (60) days of the beginning of the next
           Contract Year, to reduce Otsuka's distributorship to non-exclusive if
           Otsuka does not pay the aforesaid balance within sixty (60) days from
           the receipt by Otsuka of such notice from Calypte. Beyond such
           remedy, however, Otsuka's failure to pay or purchase the minimum
           amounts stipulated in this section shall not constitute in any way
           whatsoever a breach of this Agreement and, further, Otsuka shall not
           be

                                       30
   35
         required in any way whatsoever to pay a minimum annual amount or
         purchase a minimum number of tests in the event the distributorship
         right granted to Otsuka hereunder becomes non-exclusive. In addition,
         should Otsuka's obligation to make payments to Calypte terminate or
         become suspended under this Agreement, these minimum payment/ purchase
         provisions shall similarly be terminated or suspended.

         The following example illustrates the above provisions: Assume that in
         Contract Year 3 the price-per-test of the Product being distributed by
         Otsuka is                        per test, and that Otsuka purchases
                   tests from Calypte that year and pays Calypte           
         therefor (such payment amount includes any remaining discount to which
         Otsuka may then be entitled under Section 3.7 above). As specified
         above, in Contract Year 3 the minimum payment amount is            and
         the minimum number of tests to be purchased is          . Within sixty
         (60) days after the end of the Contract Year 3, Calypte may, in its
         discretion, send Otsuka a notice of Calypte's intention to reduce
         Otsuka's distribution rights in the Otsuka Territory to non-exclusive
         unless, within sixty (60) days following Otsuka's receipt of such
         notice, Otsuka purchases an additional         tests (for a cost of
                  at the then-prevailing price-per-test). If Otsuka elects to
         make such an additional purchase, its exclusive distributorship shall
         be preserved, but the purchase of those additional         tests shall
         not apply toward the minimum tests to be purchased in Contract Year 4.
         If Otsuka elects not to make such additional purchase, Calypte may (in
         its discretion) reduce Otsuka's distributorship to non-exclusive.


Confidential portion has been omitted and filed separately with the Commission

                                       31
   36
4.2        Promotion of the Products.

           Otsuka will, at its own expense, use its commercially reasonable
           efforts to promote the distribution of the Products and the
           performance of Services in the Otsuka Territory, consistent with the
           level of effort it uses to promote its own products of a similar
           nature. Otsuka agrees that it will not sell the Products to, or
           perform Services utilizing the Products for, customers located
           outside the Otsuka Territory without the written approval of Calypte,
           which Calypte may give or withhold, and if given, may revoke in its
           sole and absolute discretion.

4.3        Competing Products.

           Otsuka shall notify Calypte in writing not less than forty-five (45)
           days prior to marketing or distributing a Competing Product in the
           Otsuka Territory. If Otsuka commences to market and distribute a
           Competing Product in any Country in the Otsuka Territory, Otsuka's
           marketing and distribution of a Competing Product shall not be deemed
           a breach of this Agreement, but Calypte shall have the right, upon at
           least ninety (90) day's prior written notice to Otsuka, to terminate
           Otsuka's rights to distribute in such Country the Product with which
           such Competing Product competes. If at such time Otsuka is
           distributing more than one Product in such country, Calypte may only
           terminate Otsuka's rights to distribute the Product with which the
           Competing Product competes. If Japan is removed from the Otsuka
           Territory, minimum annual payments/purchases as stipulated in Section
           4.1 shall immediately be reduced by fifty percent (50%).

4.4        Customer Support.

           Otsuka agrees that Otsuka is responsible for supporting all Products
           it distributes and all Services it performs in the Otsuka Territory.
           Otsuka's support for the

                                       32
   37
           Products shall be consistent with the level of support it provides
           for its own products of similar nature. Otsuka shall maintain
           personnel sufficiently knowledgeable with respect to the Products to
           answer Subdistributor and other customer questions regarding the use
           and operation of the Products marketed by Otsuka.

4.5        Commercially Reasonable Efforts.

           Calypte acknowledges and agrees that the provisions of this Section 4
           and the provisions of Section 10 (Regulatory Approvals) are in lieu
           of any other requirements or promises, express or implied, of
           diligent, reasonable or best efforts in the marketing, sale,
           distribution or use of the Products, or that in marketing the
           Products in the Otsuka Territory Otsuka will achieve any level of
           success. In addition, the reasonable efforts and reasonable diligence
           to be put forth by Otsuka in accordance with this Section 4 and
           Section 10 shall take into account such factors (without limitation)
           as the competitiveness of alternative products in the marketplace,
           the proprietary position of the Products, the likelihood of
           regulatory approval given the regulatory structure of a given County,
           the profitability of the Products and alternative products and other
           relevant factors. Reasonable efforts shall be determined on a
           country-by-country basis, and it is anticipated that the level of
           effort will change over time reflecting changes in the status of the
           Product and the market involved.

5.         ENFORCEMENT OF CERTAIN RIGHTS

5.1        Sale of E1 System.

           Calypte shall not knowingly sell or distribute the E1 System to any
           third party, or license or otherwise permit any third party to
           manufacture or use the

                                       33
   38
           E1 System, for resale, use in or manufacture of a product that (i)
           tests (in whole or in part) for the presence of antibodies to any
           strain(s) of HIV or that tests for any human endogenous retrovirus
           and (ii) utilizes the technology embodied in the E1 System (defined
           here as an "E1 System Product") for sale in, or providing any
           services using or incorporating an E1 System Product in, a Country in
           which Otsuka has the exclusive right to sell the Products and provide
           Services. In the event that Calypte, either through its own efforts
           or by being informed by Otsuka, learns that any third party is using
           the E1 System in the manufacture of E1 System Products, or is
           incorporating technology embodied in the E1 System in any product
           that tests for the presence of antibodies to HIV or for a human
           endogenous retrovirus, for sale or distribution in or the performance
           of services in a Country, or is reselling E1 System to someone who is
           doing so, Calypte shall use its reasonable and diligent efforts to
           cause such party to discontinue such activities.

5.2        Third-Party Intellectual Property Rights.

           So long as Otsuka's rights to the Products remain exclusive in the
           Otsuka Territory, Otsuka agrees to use its reasonable efforts to keep
           abreast of filings for patents or other intellectual property rights
           in the Otsuka Territory that may impinge upon Otsuka's exclusive use
           or sale of the Products or provision of Services in the Otsuka
           Territory. Where Otsuka becomes aware of any such filings, Otsuka
           shall, at its own expense, but only to the extent it deems
           commercially appropriate and legally permissible, use its reasonable
           efforts (with no obligation to commence or pursue litigation or
           formal administrative proceedings) to assist Calypte (which shall
           bear its own expenses) in avoiding or preventing the issuance of such
           patents or other intellectual property

                                       34
   39
           rights. Where Otsuka has used its reasonable efforts with regard to
           such filings, but a patent or other intellectual property right is
           issued, Otsuka shall have those rights specified in Section 6.5
           below. In addition, Otsuka will assist Calypte with any registrations
           or filings required to obtain copyright, trademark or other
           intellectual property rights protection, in Calypte's name, for the
           Products in the Otsuka Territory under applicable law. Calypte will
           be responsible for all fees or expenses incurred in connection with
           such intellectual property rights registrations or filings.

5.3        Enforcement of Calypte Patent Rights and Calypte Technology
           in the Otsuka Territory.

           In the event that either party discovers that a third party is
           promoting, marketing, using, selling or otherwise distributing (i) an
           HIV Urine Kit or (ii) an E1 System Product (as defined in Section
           5.1) in any Country of the Otsuka Territory, such party shall notify
           the other promptly in writing. Calypte and Otsuka shall then consult
           with each other as to the best manner to proceed. Calypte shall use
           its reasonable and diligent efforts, including by bringing, defending
           and maintaining an appropriate suit or action, to obtain the
           discontinuance of the promotion, marketing, use, sale or other
           distribution of any such product in the Otsuka Territory. If, within
           six (6) months of becoming aware of the introduction of any such
           product, Calypte fails to obtain a discontinuance of the promotion,
           marketing, use, sale or other distribution of such product in such
           Country, and elects not to bring suit against such third party, or at
           any time after bringing suit chooses to abandon such suit, then
           Calypte shall give Otsuka written notice of its decision not to bring
           or to abandon suit within ten (10) days of such decision, which
           notice shall include the

                                       35
   40
           circumstances surrounding the sale of such product in such Country,
           including evidence of the infringement of any Calypte Patent Rights
           or Calypte Technology. Upon receipt of such notice, Otsuka or its
           designee may, at its option and expense, bring suit or take other
           action against such third party. Any suit or other action by Otsuka
           shall be either in the name of Otsuka or in the name of Calypte, or
           jointly in the name of both Otsuka and Calypte, as may be required by
           the law of the forum. For this purpose Calypte shall, at Calypte's
           expense, execute such legal papers necessary for the prosecution of
           such suit and provide such reasonable assistance in such suit as
           Otsuka may reasonably request. Any amounts recovered by Otsuka from
           third parties in bringing action against a party using, selling or
           otherwise distributing such products in the Otsuka Territory shall be
           applied first to reimburse the expenses incurred by the parties in
           connection with such action, and the balance shall be retained by
           Otsuka.

5.4        Reduction of Payments.

           5.4.1    In addition to the rights specified in Section 5.3, in the
                    event that anyone other than Otsuka or its designee
                    introduces any E1 System Products or HIV Urine Kit into any
                    Country in the Otsuka Territory in which Otsuka has the
                    exclusive right to sell the Products and provide Services,
                    then, upon written notice to Calypte, which notice shall
                    include reasonable evidence of the foregoing, Otsuka shall
                    have the right either: (i) to maintain its exclusive right
                    to distribute the Products in such Country but (a) reduce
                    the amounts payable per test to Calypte by twenty percent
                    (20%) with respect to the Products to be purchased by Otsuka
                    for

                                       36
   41
                    distribution in that Country of the Otsuka Territory and (b)
                    if the Country in which such HIV Urine Kit and/or E1 System
                    Products are introduced is Japan, reduce the minimum annual
                    payments/purchases stipulated in Section 4.1 by fifty
                    percent (50%), in which case Calypte shall thereafter
                    continue to supply the Products exclusively to Otsuka; or
                    (ii) to reduce its rights to distribute the Products in such
                    Country to non-exclusive, in which case Calypte shall
                    continue to supply the Products ordered by Otsuka in
                    accordance with Section 3.3, but need not do so exclusively.

           5.4.2    Notwithstanding the foregoing, where (i) Otsuka chooses to
                    maintain its exclusive rights with respect to such Country
                    and (ii) Calypte commences and diligently pursues legal
                    action against the party or parties selling HIV Urine Kits
                    or E1 System Products in such Country, then Otsuka shall pay
                    an amount equal to the twenty percent (20%) price reduction
                    under Section 5.4.1(i)(a) applicable to all purchases by
                    Otsuka from Calypte subject to such reduction in the first
                    six (6) months of such reduction into an interest-bearing
                    escrow account with a recognized bank not affiliated with
                    either party but reasonably acceptable to both parties
                    ("Escrow"). If Calypte succeeds in getting such third
                    parties to discontinue the sale, use and other distribution
                    of HIV Urine Kits and E1 System Products in such Country
                    within two (2) years, the amount payable per test to Calypte
                    shall thereafter, upon the discontinuance of the sale, use
                    and other distribution by third

                                       37
   42
                    parties of HIV Urine Kits and E1 System Products in such
                    Country, revert to the full amount payable with no 20%
                    reduction and the amounts placed in Escrow during the
                    initial six-month period shall be paid to Calypte. If
                    Calypte fails to obtain such a discontinuance within such
                    two (2) year period, or if Otsuka had exercised its right to
                    reduce its rights in the Country to non-exclusive and
                    Calypte sells Products or performs Services in such Country,
                    or grants a third party the right to do so, then the Escrow
                    shall be terminated and all amounts placed in Escrow shall
                    be returned to Otsuka.

6.         REPRESENTATIONS, WARRANTIES AND INDEMNIFICATION.


6.1        Representations and Warranties.


           6.1.1    Calypte represents and warrants that:

                    (i)    Calypte has the full power, right and authority to
                           grant the rights and licenses contained in this
                           Agreement and to enter into and carry out its
                           obligations under this Agreement;

                    (ii)   The Products, and all components thereof, will be
                           manufactured and handled in compliance with United
                           States Food and Drug Administration laws and
                           regulations and all other applicable laws and
                           regulations of the United States of America, as well
                           as all applicable laws and regulations of the country
                           of manufacture, if other than the United States of
                           America. Any Products

                                       38
   43
                           manufactured outside the United States of America
                           shall be of equivalent quality to Products
                           manufactured in the United States of America. Calypte
                           will manufacture in the United States of America all
                           Products designated by Otsuka to be used or
                           distributed in Japan, unless Otsuka (in its sole
                           discretion) agrees otherwise;

                    (iii)  Prior to manufacturing and exporting the Products,
                           Calypte will obtain all necessary governmental
                           approvals for manufacture and export of the Products;

                    (iv)   Calypte has the lawful right to grant the rights
                           contained in this Agreement under the Calypte Patent
                           Rights, which are owned and/or controlled by Calypte;

                    (v)    Otsuka's exercise of rights granted by Calypte to
                           Otsuka herein does not and will not infringe or
                           otherwise conflict with patent rights, trade secret
                           rights or other intellectual property rights of any
                           third party; provided that Calypte's sole obligations
                           and Otsuka's sole remedies with regard to breach of
                           this representation and warranty shall be as set
                           forth in Section 6.5 below;

                    (vi)   Neither Calypte nor any affiliate (including a parent
                           or subsidiary) of Calypte has previously granted, nor
                           will grant, any rights to any third party that are
                           inconsistent with the rights granted to

                                       39
   44
                           Otsuka herein, nor do or will the rights granted
                           herein conflict with any other agreement or license
                           to which Calypte or an affiliate of Calypte is or
                           becomes a party; and

                    (vii)  Calypte will not make any false or misleading
                           representations to its customers or others relating
                           to Otsuka, the Products or the rights granted to
                           Otsuka herein.

           6.1.2    Otsuka represents and warrants that:

                    (i)    Otsuka has full power, right and authority to enter
                           into and carry out its obligations under this
                           Agreement;

                    (ii)   Otsuka will not make any false or misleading
                           representations to its customers or others relating
                           to Calypte, the Products or the rights granted to
                           Otsuka herein, and will not make any representations,
                           warranties or guarantees with respect to the
                           specifications, features or capabilities of the
                           Products that conflict with Calypte's documentation
                           relating to the Products; provided that where the
                           appropriate governmental authority in a Country in
                           the Otsuka Territory permits different claims with
                           respect to a Product from those permitted by the FDA
                           in the United States of America, Otsuka may establish
                           the permitted scope of claims consistent with the
                           approvals of such governmental authority;

                                       40
   45
                    (iii)  If Otsuka exports Products from Japan to other
                           Countries in the Otsuka Territory, Otsuka will use
                           reasonable diligence to obtain necessary export
                           licenses and permits required to accomplish Otsuka's
                           lawful export from Japan to other Countries in the
                           Otsuka Territory, if any, of the Products purchased
                           by Otsuka hereunder; and

                    (iv)   Otsuka has obtained, or will use its reasonable and
                           diligent efforts to obtain, any and all consent,
                           approval, license and/or authorization of any
                           governmental authority of Japan required in
                           connection with the valid execution of this
                           Agreement.

6.2        Product Limited Warranty.

           6.2.1    Calypte warrants (i) that all Products, when delivered, will
                    have a remaining usable shelf life (as measured against the
                    "use before" date stamped on such Products) of at least the
                    lesser of (x), twelve (12) months or (y) the expiration date
                    authorized in applicable approval licenses issued with
                    respect to such Product by the relevant governmental
                    authorities ("Shelf Life"), and (ii) that each Product will
                    conform to the then-current SPECIFICATIONS for such Product
                    and will be free of defects in material, workmanship and
                    packaging.

           6.2.2    The express warranties set forth in Section 6.2.1 above will
                    not apply to defects in a Product: (a) caused through no
                    fault of Calypte (or a third-party supplier of the

                                       41
   46
                    Product designated by Calypte) during shipment to Otsuka by
                    the international carrier, (b) caused by the storage of the
                    Products outside of the designated environmental
                    specifications after receipt by Otsuka, (c) caused by
                    modifications or alterations made to the Products by any
                    party other than Calypte after shipment by Calypte, or (d)
                    caused by the unauthorized use of the Products by Otsuka or
                    any third party, or use inconsistent with the protocol
                    accompanying such Product.

           6.2.3    Calypte's sole obligation, and Otsuka's sole remedies (in
                    addition to Calypte's obligations and Otsuka's remedies
                    under Section 6.4 and Section 6.6) for any breach of this
                    warranty will be for Calypte to promptly replace at
                    Calypte's expense any Product which does not conform to this
                    warranty, or where replacement is impractical, to refund
                    Otsuka's purchase price therefor and insurance and shipping
                    expenses incurred in connection therewith. Products returned
                    under this warranty will be returned and replaced according
                    to the same procedures established for rejected Products
                    under Section 3.11 above.

6.3        Limitation.

           EXCEPT FOR THE EXPRESS WARRANTIES IN THIS AGREEMENT, CALYPTE PROVIDES
           NO WARRANTIES FOR THE PRODUCTS, EXPRESS OR IMPLIED, EITHER IN FACT OR
           BY OPERATION OF LAW, STATUTORY OR OTHERWISE, AND CALYPTE AND OTSUKA
           SPECIFICALLY DISCLAIM ANY IMPLIED WARRANTY OR MERCHANTABILITY OR
           FITNESS FOR A PARTICULAR PURPOSE BEYOND THE EXPRESS WARRANTIES IN
           THIS AGREEMENT.

                                       42
   47
6.4        Indemnification.

           6.4.1    Calypte hereby agrees to defend and indemnify Otsuka,
                    Affiliates and Subdistributors against, and hold Otsuka,
                    Affiliates and Subdistributors harmless from, any loss,
                    cost, liability or expense (including court costs,
                    arbitration expenses and reasonable fees of attorneys and
                    other professionals) arising out of or in connection with a
                    breach of Calypte's representations and warranties in
                    Sections 6.1.1 and 6.2, provided that, in the case of a
                    claim, lawsuit or arbitration: (i) Calypte shall have sole
                    control of such defense, though Otsuka, in its discretion,
                    may participate in such defense through attorneys of its
                    choice; (ii) Otsuka does not settle any claim without
                    Calypte's prior written consent; and (iii) Otsuka shall
                    provide notice promptly to Calypte of any actual or
                    threatened claim of which Otsuka becomes aware. Calypte
                    agrees to procure insurance coverage for the obligations
                    described in this Section 6.4.1. In the event of any such
                    claim, Otsuka shall provide Calypte, at Calypte's expense,
                    information and assistance as Calypte may reasonably request
                    for purposes of defense of such claim.

           6.4.2    Otsuka hereby agrees to defend and indemnify Calypte
                    against, and hold Calypte harmless from, any loss, cost,
                    liability or expense (including court costs, arbitration
                    expenses and reasonable fees of attorneys and other
                    professionals) arising out of or in connection with any
                    action or claim, brought or threatened, arising from a

                                       43
   48
                              breach of Otsuka's representations and warranties
                              and the use or sale of the Products by Otsuka, its
                              Affiliates and Subdistributors, excluding any
                              loss, cost, liability or expense covered by
                              Sections 6.4.1, 6.5 or 6.6 or resulting from a
                              breach of this Agreement by Calypte, and
                              specifically (without limitation) excluding any
                              obligation on the part of Otsuka to enforce or
                              defend the Calypte Patent Rights or to defend,
                              indemnify or hold Calypte harmless from any action
                              or claim alleging that Otsuka's use or sale of the
                              Products infringes a third party's patent or other
                              intellectual property rights. Otsuka's obligations
                              hereunder are contingent upon (i) Otsuka having
                              sole control of such defense, though Calypte, in
                              its discretion, may participate in such defense
                              through attorneys of its choice; (ii) Calypte
                              providing notice promptly to Otsuka of any actual
                              or threatened claim of which Calypte becomes
                              aware; and (iii) Calypte not settling any claim
                              without Otsuka's prior written consent. In the
                              event of any such claim, Calypte shall provide
                              Otsuka, at Otsuka's expense, information and
                              assistance as Otsuka may reasonably request for
                              purposes of defense of such claim.

6.5          Intellectual Property Infringement Indemnity.

             6.5.1        Calypte agrees to defend and indemnify Otsuka,
                          Affiliates and Subdistributors against, and hold
                          Otsuka, Affiliates and Subdistributors harmless from,
                          any loss, cost, liability or expense (including court
                          costs, arbitration expenses and


                                       44
   49
reasonable attorney's fees) arising out of or in connection with any action or
claim brought or threatened against Otsuka, an Affiliate or Subdistributor
alleging that the Products under normal use infringe any third party's patent,
copyright, trademark, trade secret or other intellectual property right;
provided that Calypte will be released from its obligations under this Section
6.5 unless Otsuka provides Calypte with (i) prompt written notice of such claim
or action of which Otsuka becomes aware, (ii) sole control and authority over
the defense or settlement of such claim or action, though Otsuka, the Affiliate
or Subdistributor, in Otsuka's discretion, may participate in such defense and
settlement discussions, and (iii) information and reasonable assistance, at
Calypte's expense, to defend and/or settle any such claim or action.

In addition, without limiting the above remedies and obligations, in the event
that, and only for so long as, Otsuka is reasonably required to pay to a third
party royalties or license fees to avoid infringement of patent rights or other
intellectual property rights of such third party by use or sale of the Products
or related Services, Otsuka shall be entitled to deduct (as a credit) from any
amounts otherwise payable to Calypte the full amount of such royalties and
license fees actually paid to such third party, at a rate of twenty percent
(20%) of the amounts otherwise payable to Calypte until Otsuka is fully
reimbursed or compensated for such third party payments; provided that Otsuka
shall be


                                       45
   50
                  entitled to such deduction or credit if the cause of such
                  infringement is the use or sale of the Product or Service, as
                  opposed to such infringement stemming from the combination of
                  Products with other infringing products not provided by
                  Calypte.

6.5.2             In the event that any Product is held or, in Calypte's sole
                  opinion, may be held to constitute such an infringement,
                  Calypte shall, at its option and expense, either: (i) obtain
                  for Otsuka the right to continue to use such Product as
                  intended, or (ii) modify such Product so that it becomes
                  non-infringing, but without materially altering the use or
                  functionality of the Product, or (iii) replace such Product
                  with a functionally equivalent non-infringing Product or, if
                  none of the remedies in (i), (ii) or (iii) is reasonably
                  available despite Calypte's best efforts to achieve them, (iv)
                  accept return of the infringing Products and immediately
                  refund to Otsuka the purchase price paid therefor, and
                  thereafter the Country in which such infringement action arose
                  shall be removed from the Otsuka Territory with respect to
                  such Product.

6.5.3             Notwithstanding the provisions of Section 6.5.1 above,
                  Calypte assumes no liability for infringement claims
                  arising from (i) combination of Products with other
                  products not provided by Calypte, but not applicable to
                  or covering such Products standing alone, (ii) the
                  modification of Products unless such modification was
                  made or authorized by Calypte, where such infringement


                                       46
   51
                  claims would not have occurred but for such modifications, or
                  (iii) any marking or branding placed on the Products by, or at
                  the request of, Otsuka.

6.5.4             THE FOREGOING, INCLUDING SECTIONS 5 AND 6, STATES THE ENTIRE
                  LIABILITY AND OBLIGATIONS OF CALYPTE AND THE EXCLUSIVE REMEDY
                  OF OTSUKA, WITH RESPECT TO ANY ALLEGED OR ACTUAL INFRINGEMENT
                  OF PATENTS, COPYRIGHTS, TRADE SECRETS, TRADEMARKS OR OTHER
                  INTELLECTUAL PROPERTY RIGHTS BY THE PRODUCTS.

6.6        Products Liability Indemnity. 

           Calypte agrees to defend and indemnify Otsuka, Affiliates and
           Subdistributors against, and hold Otsuka, Affiliates and
           Subdistributors harmless from, any loss, cost, liability or expense
           (including court costs, arbitration expenses and reasonable
           attorney's fees) arising out of or in connection with any action or
           claim brought or threatened against Otsuka, Affiliates or
           Subdistributors alleging that a Product caused personal injury, death
           or property damage; provided that (i) Calypte shall have sole control
           of such defense, though Otsuka, in its discretion, may participate in
           such defense through attorneys of its choice; (ii) Otsuka does not
           settle any claim without Calypte's prior written consent; and (iii)
           Otsuka shall provide notice promptly to Calypte of any actual or
           threatened claim of which Otsuka becomes aware.

7.         CONFIDENTIALITY

7.1        Confidential Information.

           Otsuka and Calypte acknowledge that during the term of this
           Agreement each party will be exposed to certain


                                       47
   52
           information concerning the other party's business (including, without
           limitation, customer lists), technology, products, proposed new
           products, product costs, product prices, finances, marketing plans,
           business opportunities, research, development or know-how which is
           confidential and proprietary to the other party and is not generally
           known to the public ("Confidential Information"). Otsuka and Calypte
           agree that during and after the term of this Agreement, Otsuka and
           its Affiliates and Calypte and its Affiliates will not use and will
           not disclose any Confidential Information of the other party except
           in accordance with the provisions and for the purposes of this
           Agreement (which include and permit Otsuka's promotion, use, sale and
           other distribution of the Products). Without limiting the foregoing,
           all information pertaining to the Products and/or Calypte Patent
           Rights conspicuously marked by Calypte as confidential shall be
           deemed Confidential Information of Calypte, and Otsuka agrees that
           Otsuka and Affiliates will take reasonable steps not to disclose any
           such conspicuously marked Confidential Information of Calypte to any
           third party (not including Subdistributors as reasonably necessary,
           or counsel or consultants of Otsuka and Affiliates, or third-party
           manufacturers in the event Otsuka becomes entitled to manufacture or
           have manufactured the Products in accordance with this Agreement)
           without the prior written consent of Calypte, except as permitted in
           this Agreement. Also, without limiting the foregoing, Calypte agrees
           that it will take reasonable steps not to disclose to any third party
           (not including counsel and consultants of Calypte) without the prior
           written consent of Otsuka any other Confidential Information
           conspicuously marked as such by Otsuka, except as permitted in this
           Agreement. Otsuka further agrees that Otsuka, including, without
           limitation, Affiliates and


                                       48
   53
           Subdistributors, will not reverse engineer the Products in order to
           enable Otsuka, Affiliates, or any third parties to manufacture the
           Products in violation of this Agreement. The provisions of this
           Section 7 shall survive any termination of this Agreement.

7.2        Confidentiality of Agreement.
           Each party agrees that the terms and conditions of this Agreement
           shall be treated as Confidential Information and that no reference to
           this Agreement or to the terms hereof can be made in any form of
           public or commercial advertising without the prior written consent of
           the other party. All publicity regarding the announcement of this
           Agreement shall be coordinated by both parties. Notwithstanding the
           foregoing, each party may disclose the terms and conditions of this
           Agreement: (a) as required by any court or other governmental body;
           (b) as otherwise required by law; (c) to legal counsel and
           consultants of the parties; (d) to accountants, banks and financing
           sources and their advisors; (e) in connection with the enforcement of
           this Agreement or rights under this Agreement; or (f) in connection
           with a merger or acquisition or proposed merger or acquisition, or
           the like.

7.3        Exceptions.
           The restrictions of Sections 7.1 and 7.2 will not apply to
           Confidential Information that (i) is already known to the receiving
           party at the time of disclosure to the receiving party; (ii) has
           become publicly known through no wrongful act or omission of the
           receiving party; (iii) has been rightfully received by the receiving
           party from a third party without restriction on disclosure and
           without breach of an obligation of confidentiality running directly
           or indirectly to the disclosing party; (iv) has been approved


                                       49
   54
           for release by written authorization of the disclosing party; (v) is
           independently developed by the receiving party without use, directly
           or indirectly, of the Confidential Information; or (vi) is furnished
           to a third party by the disclosing party without restrictions on the
           third party's right to disclose the information. The parties agree
           that in the event of a dispute with respect to (v) above, the alleged
           breaching party shall bear the burden of proof by a preponderance of
           the evidence that it developed such information without use, directly
           or indirectly, of Confidential Information. In addition, Calypte and
           Otsuka may use Confidential Information as reasonably necessary in
           (a) filing or prosecuting patent applications, (b) prosecuting or
           defending litigation, (c) dispute resolution under Section 12.5, (d)
           complying with applicable governmental regulations or conducting
           preclinical or clinical trials, and (e) responding to a lawful
           governmental demand, all with prior notice to the other party and
           with safeguards as appropriate.

7.4        Remedies.
           A breach of the restrictions contained in this Section 7 is a breach
           of this Agreement which may cause irreparable harm to the
           non-breaching party and may, under applicable laws, entitle the
           non-breaching party, in addition to any other right or remedy
           available, to obtain from any court of competent jurisdiction an
           injunction (temporary, preliminary or permanent), or other interim,
           ancillary or conservatory remedy or relief, restraining such breach
           or threatened breach and specific performance of any such provision.
           The parties agree that no bond or other security shall be required in
           obtaining such equitable relief.


                                       50
   55
8.         LIMITATION OF LIABILITY

           IN NO EVENT, EXCEPT AS PROVIDED BELOW, WILL EITHER PARTY BE LIABLE TO
           THE OTHER FOR ANY SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR INDIRECT
           DAMAGES ARISING IN ANY WAY OUT OF THIS AGREEMENT, HOWEVER CAUSED AND
           ON ANY THEORY OF LIABILITY; THIS LIMITATION WILL APPLY EVEN IF THE
           OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE,
           PROVIDED, HOWEVER, THAT THIS LIMITATION SHALL NOT APPLY TO A BREACH
           OF THE CONFIDENTIALITY PROVISION SET FORTH IN SECTION 7 ABOVE WITH
           RESPECT TO ANY GMP PROCEDURES DISCLOSED TO OTSUKA PURSUANT TO SECTION
           2.4; PROVIDED FURTHER THAT THIS LIMITATION SHALL NOT APPLY TO OR
           LIMIT A PARTY'S OBLIGATIONS TO INDEMNIFY, DEFEND AND HOLD THE OTHER
           PARTY HARMLESS UNDER CIRCUMSTANCES EXPRESSED IN THIS AGREEMENT.

9.         TRADEMARKS AND TRADE NAMES.

9.1        Use.

           So long as Otsuka purchases Products from Calypte during the term of
           this Agreement, Otsuka shall indicate to the public that the Products
           incorporate and/or use El System under the trademarks, marks, and
           trade names that Calypte may adopt from time to time with respect to
           El System and the Products ("Calypte's Marks"); provided that this
           obligation is contingent upon Calypte registering Calypte's Marks in
           the Otsuka Territory and obtaining authorization from the relevant
           governmental authorities to use Calypte's Marks (Calypte shall give
           Otsuka written notice of such registration and authorization). Otsuka
           shall not alter or remove any such approved Calypte's Marks applied
           to the packaging of the Products by Calypte, where such packaging is
           as mutually agreed by Otsuka and Calypte. Except as set forth in this
           Section 9.1 and as otherwise permitted under this Agreement, nothing


                                       51
   56
           contained in this Agreement shall grant to Otsuka any right, title or
           interest in any of Calypte's Marks. At no time during the term of
           this Agreement shall Otsuka challenge or assist others in challenging
           any lawfully approved Calypte's Marks used in conjunction with the El
           System or the Products or the registration thereof or attempt to
           register any trademarks, marks or trade names confusingly similar to
           those used by Calypte. In the event a Releasing Event occurs whereby
           Otsuka manufactures, or has manufactured, the Product under the GMP
           Procedures, Otsuka shall have no right to sell or distribute such
           Products under Calypte's Marks, except to the extent required by law,
           and any use in violation thereof shall constitute an infringement of
           Calypte's rights.

9.2        Approval of Representations
           All representations of Calypte's Marks that Otsuka intends to use
           shall first be submitted to Calypte for approval (which shall not be
           unreasonably withheld) of design, color, size and other details or
           shall be exact copies of those used by Calypte, subject to variation
           only as reasonably agreed by Calypte. If any of Calypte's Marks are
           to be used in conjunction with another trademark on or in relation to
           the Products, then Calypte's Marks shall be presented as reasonably
           agreed by Calypte and Otsuka, separated from the other so that each
           appears to be a mark in its own right, distinct from the other mark.

10.        REGULATORY APPROVALS.

10.1       Obtainment of Approvals.
           Subject to Calypte's fulfilling its obligations under Section
           6.1.1(iii), and so long as Otsuka is the exclusive distributor of the
           Products in the Otsuka Territory,


                                       52
   57
           Otsuka shall use its reasonable diligence in obtaining necessary
           governmental approvals or licenses for the distribution and sale of
           the Products, which approvals and licenses shall be in Otsuka's name
           and owned by Otsuka, subject to Section 10.6; provided, that Calypte
           shall provide assistance and support as is reasonably necessary, at
           Otsuka's cost and expense, in obtaining any such approval or
           licenses. Otsuka shall promptly provide to Calypte (or directly to
           the governmental agency, at Otsuka's option) all information relating
           to Otsuka's use, sale and distribution of the Products that Calypte
           is required to provide to the Food and Drug Administration of the
           United States of America or any other governmental agency. Calypte
           and Otsuka agree to disclose promptly to the other all reports and
           any information which they have available or which become available
           to them relating to the safety and efficacy caused by or related to
           the Products.

10.2       Reasonable Diligence.
           Otsuka's aforesaid reasonable due diligence to obtain governmental
           approvals in the Otsuka Territory shall be satisfied as follows with
           respect, separately, to: (a) Countries in which registration of the
           Products with governmental authorities can be done on the basis of
           the approved United States PLA ("PLA Countries") and (b) Countries
           which require the filing of a separate application for marketing
           approval to local governmental authorities ("Separate Filing
           Countries"). Each Country of the Otsuka Territory shall be classified
           into one of these groups based upon its governmental requirements.


                                       53
   58
10.3       PLA Countries.
           Within six (6) months after the later to occur of (a) Otsuka's
           receipt from Calypte of the approved U.S. PLA materials necessary for
           submitting a complete application package to governmental authorities
           in PLA Countries, or (b) the execution of this Agreement, Otsuka
           shall undertake to submit an application for governmental approval to
           market the Products in such Countries of the Otsuka Territory.
           Further, Otsuka shall undertake to commercially launch the Products
           in PLA Countries within six (6) months of receiving approval of its
           application to market the Products from the appropriate governmental
           authority in such Countries.

           In the event Otsuka does not submit an application package within the
           specified period in a PLA Country, the parties shall discuss the
           reasons for the delay, and Calypte shall not unreasonably withhold
           its consent to a ninety (90) day extension. If Otsuka does not submit
           its application package within the extended period, Calypte shall, at
           the end of that extended period, have an option for ninety (90) days
           to convert Otsuka's distribution rights from an exclusive to a
           non-exclusive basis in that Country of the Otsuka Territory.

           In the event Otsuka does not commercially launch the Products in a
           PLA Country within the specified period, the parties shall discuss
           the reasons for the delay, and Calypte shall not unreasonably
           withhold its consent to a ninety (90) day extension for that Country.
           If Otsuka does not commercially launch the Products within the
           extended period, Calypte shall, at the end of that extended period,
           have an option for ninety (90) days to convert Otsuka's distribution
           rights from an exclusive to


                                       54
   59
           a non-exclusive basis in that Country of the Otsuka Territory.

10.4       Separate Filing Countries.
           Within twelve (12) months after the later of (a) Otsuka's receipt
           from Calypte of all data (in Calypte's possession or available to
           Calypte) necessary to initiate clinical studies, or (b) the execution
           of this Agreement, Otsuka shall initiate clinical trials in those
           Countries of the Otsuka Territory that require them. Further, Otsuka
           shall use its best efforts to submit its application package (for
           marketing approval) to governmental authorities within twelve (12)
           months of initiating clinical trials, provided that Calypte provides
           in a timely fashion all data necessary to complete the application
           package either through Otsuka or directly to the appropriate
           governmental authorities.

           In the event Otsuka does not initiate clinical studies within the
           specified period in a Separate Filing Country, the parties shall
           discuss the reasons for the delay, and Calypte shall not unreasonably
           withhold its content to a ninety (90) day extension. If Otsuka does
           not initiate clinical studies within the extended period, Calypte
           shall, at the end of that extended period, have an option for ninety
           (90) days to convert Otsuka's distribution rights from an exclusive
           to a non-exclusive basis in that Country of the Otsuka Territory.

           In the event Otsuka does not submit its application package to
           governmental authorities in a Separate Filing Country within the
           specified period, the parties shall discuss the reasons for the
           delay, and Calypte shall not unreasonably withhold its consent to a
           ninety (90) day extension. If Otsuka does not submit its application


                                       55
   60
           package to governmental authorities within the extended period, and
           if the failure to submit such application package is reasonably
           within Otsuka's control, Calypte shall, at the end of that extended
           period, have an option for ninety (90) days to convert Otsuka's
           distribution rights from an exclusive to a non-exclusive basis in
           that Country of the Otsuka Territory.

10.5       Extension of Time Periods.
           The time periods specified above for Otsuka's reasonable diligence in
           introducing the Products in any Country of the Otsuka Territory shall
           be extended in that Country by (a) the duration of Force Majeure
           circumstances which delay Otsuka's performance; (b) unanticipated
           governmental requests or requirements which delay Otsuka's
           performance; and (c) actions or inactions by Calypte which delay
           Otsuka's performance.

           In addition, the time period for the commercial launch of the
           Products in a Country of the Otsuka Territory shall be automatically
           extended for an additional two (2) week period for each month less
           than six (6) months taken to submit the application package for that
           Country. In the case of Separate Filing Countries, the time period
           for submitting the marketing approval application package in a
           given Country shall be automatically extended for an additional two
           (2) week period for each month less than twelve (12) months taken to
           initiate clinical trials in that Country.

10.6       Assignment Upon Termination.
           Except in the event of abandonment as per Section 11.8 or in the
           event of termination of this Agreement by Otsuka due to breach of
           this Agreement by Calypte, immediately upon termination of Otsuka's
           right to distribute the


                                       56
   61
           Products in any Country of the Otsuka Territory, Otsuka shall use
           reasonable efforts to assign to Calypte, and subject to the
           occurrence of such an event, does hereby assign to Calypte, all
           regulatory approvals, licenses, etc. then in Otsuka's possession
           required for the use, marketing and sale of the Products in such
           Country, all to the extent permitted under applicable law. In the
           event of such an assignment, Otsuka shall, at Calypte's request and
           expense, deliver execute and/or deliver or cause to be delivered, all
           such assignments, consents, documents or further instruments of
           transfer or license, and take or cause to be taken all such actions
           as may be reasonably necessary to effectuate such transfer.

11.        TERM AND TERMINATION

11.1       Term.
           Unless earlier terminated pursuant to the provisions of this
           Agreement, this Agreement shall have an initial term extending from
           Effective Date until the end of tenth (10th) Contract Year, and may
           be renewed by mutual agreement.

11.2       Termination for Convenience.
           At any time and for any reason or for no reason, Otsuka, at Otsuka's
           sole option, may terminate this Agreement in its entirety. Such
           termination shall be effective one hundred twenty (120) days after
           receipt by Calypte of Otsuka's written notice of termination. In the
           event of any termination for convenience, Otsuka shall (a) use
           reasonable efforts to transfer government approvals to Calypte as
           provided in Section 10.6 above; (b) provide Calypte with the name,
           addresses, phone, fax and telex numbers and contact person at each of
           Otsuka's non-Affiliate Subdistributors of the Products, to the extent


                                       57
   62
           available to Otsuka; and (iii) Otsuka shall not interfere with or
           prevent any such non-Affiliate Subdistributor of Products from
           entering into a relationship directly with Calypte or sharing such
           Subdistributor's Product customer lists with Calypte. The one hundred
           and twenty (120) day notice period shall be reduced if Otsuka
           completes the transfer of all necessary government approvals and
           delivers the Subdistributor information in less than one hundred
           twenty (120) days.

11.3       Termination for Cause.

           Without limiting Otsuka's rights in Section 11.2 above, this
           Agreement may be terminated by either party upon any material breach
           or default by the other party at any time after sixty (60) days'
           prior written notice to the breaching party specifying the nature of
           the breach or default; provided that, if during said sixty (60) days
           the party so notified cures the breach or default complained of, then
           this Agreement shall continue in full force and effect; provided
           further that if the alleged breaching party disputes having committed
           a material beach or default or claims to have cured such breach or
           default prior to or within the sixty (60) day period, such dispute
           shall be resolved by prompt arbitration in accordance with Section
           12.5, and this Agreement shall not terminate under this Section
           11.3 until the conclusion of such arbitration, and then only if the
           arbitrators decide in favor of the non-breaching party seeking
           termination.


                                       58
   63
11.4       Termination for Bankruptcy.

           This Agreement may be terminated by either party upon written notice
           immediately without opportunity to cure if the other party becomes
           the subject of a voluntary or involuntary petition in bankruptcy or
           any proceeding relating to insolvency, receivership, liquidation, or
           composition for the benefit of creditors, if that petition or
           proceeding is not dismissed with prejudice within sixty (60) days
           after filing.

11.5       Effect of Termination.

           11.5.1     Termination of this Agreement pursuant to either Section
                      11.2, 11.3 or 11.4 shall not relieve the parties of any
                      obligation accruing prior to such termination.

           11.5.2     Upon termination of this Agreement by Otsuka pursuant to
                      Section 11.2 or by either party pursuant to Section 11.3
                      or 11.4, Otsuka shall provide Calypte with a written
                      notice stating the inventory of all the Products in
                      Otsuka's stock.

           11.5.3     Upon termination of this Agreement pursuant to Section
                      11.2, 11.3 or 11.4, Otsuka may use and sell or otherwise
                      distribute and dispose of the Products within one (1) year
                      after termination of this Agreement.

11.6       No Liability For Expiration or Termination.
           Without limiting party's rights, obligations and remedies under this
           Agreement, neither Calypte nor Otsuka will, solely by reason of the
           expiration or termination of this Agreement, be liable to the other
           for compensation,


                                       59
   64
           reimbursement or damages on account of any loss of prospective
           profits or anticipated sales or on account of expenditures,
           investments, leases, or commitments made in connection with this
           Agreement or the anticipation of extended performance hereunder.

11.7       Survival.
           The following provisions shall survive expiration or termination of
           this Agreement: Sections 6, 7, 8, 11.6 and 12.

11.8       Abandonment.
           Whether or not Otsuka's rights in the Otsuka Territory remain
           exclusive, Otsuka shall be free, in its discretion, to abandon its
           rights and obligations (either all of its rights and obligations or
           on a Product-by-Product basis) in a given Country of the Otsuka
           Territory for any or no reason. In such case, Otsuka shall give
           Calypte at least sixty (60) days prior written notice of such
           decision, after which Calypte shall then be free to grant exclusive
           distribution rights to the abandoned Products in such Country to a
           third party or undertake such distribution itself. If Otsuka has
           exclusive rights in the Otsuka Territory at the time it abandons such
           rights in a given Country, the minimum payments/purchases described
           in Section 4.1 shall continue without reduction with respect to the
           rest of the Otsuka Territory; provided that, if Otsuka abandons its
           rights in Japan, such minimum amounts shall be reduced by fifty
           percent (50%). Otsuka may manifest its lack of intention to market
           the Products in a Country by complete inaction during the specified
           time periods with respect to seeking governmental approval for the
           marketing of the Products or with respect to the commercial launch of
           the Products in such Country. Such inaction shall be deemed
           constructive abandonment by


                                       60
   65
           Otsuka of its distribution rights in such Country; provided that such
           constructive abandonment shall only be effective if Calypte gives
           Otsuka written notice of same, describing the circumstances on which
           it bases its conclusion of constructive abandonment, and Otsuka fails
           to remedy such circumstances within sixty (60) days of its receipt of
           such notice.

           In the event Otsuka abandons its distribution rights in any Country
           of the Otsuka Territory, Otsuka shall cooperate with Calypte to
           transfer its application for marketing approval (if any) in that
           Country to Calypte (or its licensee) to the extent local regulations
           permit, provided that Calypte shall reimburse Otsuka for its
           reasonable direct expenses incurred in making the application.

12.        GENERAL PROVISIONS

12.1       Currency.
           All payment amounts set forth herein, and all obligations of Calypte
           and Otsuka relating to the payment or receipt of money, shall be paid
           in United States of America Dollars, except as otherwise provided in
           this Agreement.

12.2       Language.
           This Agreement is in the English language, which language shall be
           controlling in all respects, and all versions hereof in any other
           language shall be for accommodation only and shall not be binding
           upon the parties hereto. All communications and notices to be made or
           given pursuant to this Agreement shall be in the English language.


                                       61
   66
12.3       Governing Law.
           This Agreement shall be governed by, and construed and interpreted in
           accordance with, the laws of the State of California, United States
           of America, without reference to conflict of laws principles, except
           that (i) patent rights in connection with the rights granted by
           Calypte to Otsuka hereunder shall be governed by the laws of the
           country in which such patent rights were obtained and (ii) perfection
           of title reserved by Calypte pursuant to Section 3.12 shall be
           governed by the laws of Japan.

12.4       Jurisdiction.
           Subject to Section 12.5, the parties to this Agreement consent to
           personal and exclusive jurisdiction of and exclusive venue in the
           state and federal courts located within the Northern District of
           California. Otsuka and Calypte hereby expressly consent to (i) the
           personal jurisdiction of the federal and state courts within
           California, (ii) service of process being effected upon it by
           registered mail sent to the address set forth in Section 12.11, and
           (iii) the enforcement of a final judgment from such court, following
           the conclusion of any appeal of such judgment or expiration of the
           time to file such an appeal, whichever is later, in any other
           jurisdiction wherein the party against whom enforcement is sought or
           any of its assets are present, provided that such enforcement is
           conducted in accordance with the laws and procedures of the
           jurisdiction in which enforcement is sought.

12.5       Arbitration.
           Otsuka and Calypte agree that any dispute or controversy arising out
           of, in relation to, or in connection with this Agreement, or the
           making, interpretation, construction, performance or breach thereof,
           shall be finally settled by


                                       62
   67
           binding arbitration in San Francisco, California, United States of
           America, under the then-current Rules of Arbitration of the
           International Chamber of Commerce by three (3) arbitrators appointed
           in accordance with such Rules. The arbitral proceedings and all
           written evidence shall be in the English language. Any written
           evidence originally in a language other than English shall be
           submitted in English translation accompanied by the original or a
           true copy thereof. The arbitrators may grant injunctive or other
           relief in such dispute or controversy. The decision of the
           arbitrators shall be final, conclusive and binding on the parties to
           the arbitration. After the decision of the arbitrators, judgment may
           be entered on that decision in any court of competent jurisdiction.
           The parties agree that, any provision of applicable law
           notwithstanding, they will not request, and the arbitrators and
           courts shall have no authority to award, punitive or exemplary
           damages against any party. The costs of the arbitration, including
           administrative fees and fees of the arbitrators, shall be shared
           equally by the parties. Each party shall bear the cost of its own
           attorney's fees and expert witness fees. Notwithstanding the
           foregoing, either party shall have the right to apply to any court of
           competent jurisdiction for injunctive relief without breach of this
           arbitration provision.

12.6       Force Majeure.

           Except for obligations relating to the payment of money, neither
           party shall be liable for any loss, damage or penalty resulting from
           delays or failures in performance of its obligations resulting from
           acts of God or other causes beyond its control, including
           governmental restrictions and prohibitions; provided that, in the
           event of such delay or failure, the affected party will use its


                                       63
   68
           best efforts, consonant with bound business judgment and to the
           extent permitted by law, to correct such delay or failure as
           expeditiously as possible; provided further that this Section 12.6
           will not extend or delay the time period or periods during which
           Calypte is to ship supplies of the Products in accordance with
           Section 3 nor affect Otsuka's right to obtain and use the GMP
           Procedures under the terms and conditions of this Agreement and the
           Escrow Agreement. Each party agrees to notify the other promptly of
           any circumstance delaying its performance and to resume performance
           as soon thereafter as is reasonably practicable.

12.7       Assignment.
           Except as expressly provided in this Agreement with respect to
           specified rights and obligations, neither party may assign or
           otherwise transfer its rights or obligations under this Agreement to
           a third party without the prior written consent of the other party,
           which shall not be unreasonably withheld. Any such approved
           third-party transferee or assignee must agree to be bound by the
           terms and conditions of this Agreement.

12.8       No Third-Party Beneficiaries.
           Calypte and Otsuka intend that only Calypte and Otsuka, and Otsuka's
           Affiliates and Subdistributors, will benefit from, and are entitled
           to enforce the provisions of, this Agreement and that no other
           third-party beneficiary is intended under this Agreement.

12.9       Bankruptcy Code.
           Calypte and Otsuka acknowledge and agree that this Agreement is
           subject to Section 365(n) of Title 11, United States Code (the
           "Bankruptcy Code"). If Calypte is a debtor in possession or if a
           trustee in bankruptcy is


                                       64





   69
         appointed for Calypte in a case under the Bankruptcy Code and such
         debtor in possession or trustee rejects this Agreement, Otsuka may
         elect to treat this Agreement as terminated or to retain its rights
         under this Agreement as provided in Section 365(n) of the Bankruptcy
         Code. If Otsuka elects to retain its rights under this Agreement, then
         upon written request to Calypte or the bankruptcy trustee, Calypte or
         such bankruptcy trustee shall not interfere with the rights of Otsuka
         as provided in this Agreement.

12.10    Modifications.
         No modification to this Agreement, nor any waiver of any rights, shall
         be effective unless assented to in writing by the party to be charged,
         and the waiver of any breach or default shall not constitute a waiver
         of any other right hereunder or any subsequent breach or default.

12.11    Notices.
         Any required notices hereunder shall be in writing and shall be deemed
         given if delivered (i) in person, or (ii) by prepaid express courier,
         or (iii) by registered or certified mail (return receipt requested), at
         the address of each party set forth below, or to such other address as
         either party may substitute by written notice to the other in the
         manner contemplated herein, and shall be deemed served upon receipt or,
         if receipt is not accomplished by reason of some fault of the
         addressee, when tendered.

                 If to Calypte:       William A. Boeger
                                      President
                                      Calypte Biomedical Corporation
                                      1440 Fourth Street
                                      Berkeley, California 94710 U.S.A.



                                       65
   70
                 If to Otsuka:         Hideji Nonomura
                                       Director of Overseas Affairs
                                       Diagnostic Division
                                       Otsuka Pharmaceutical Co., Ltd.
                                       463-10 Kagasuno
                                       Kawauchi-cho, Tokushima Japan

12.12    Descriptive Headings.
         The headings of the several sections of this Agreement are intended for
         convenience of reference only and are not intended to be a part of or
         to affect the meaning or interpretation of this Agreement.

12.13    Entire Agreement.
         This Agreement, including the exhibits hereto, constitutes the entire
         and exclusive Agreement between the parties hereto with respect to the
         subject matter hereof, and supersedes and cancels all previous
         registrations, agreements, commitments and writings in respect thereof.

12.14    Severability.
         In the event that any provision of this Agreement becomes or is
         declared by arbitrators or a court of competent jurisdiction to be
         illegal, unenforceable or void, this Agreement shall continue in full
         force and effect without said provision; provided that no such
         severability shall be effective if it materially changes the economic
         benefit of this Agreement to either Calypte or Otsuka.

12.15    Legal Expenses.
         Except as otherwise expressly provided herein, the prevailing party in
         any legal action brought by one party against the other and arising out
         of or in connection with this Agreement shall be entitled, in addition
         to any other rights and remedies it may have, to reimbursement from the
         other party for its expenses, including court costs,


                                       66
   71
         arbitration expenses and reasonable fees and expenses for attorneys and
         other professionals.

12.16    Counterparts.
         This Agreement may be executed in counterpart, each of which shall be
         deemed an original, but both of which together shall constitute one and
         the same instrument.

12.17    Import & Export Controls.
         Otsuka understands that Calypte is subject to export regulation by
         agencies of the U.S. government, including the U.S. Department of
         Commerce, which prohibit export or diversion of certain products and
         technology to certain countries ("U.S. Export Regulations"). Calypte
         warrants that it is unaware of any U.S. Export Regulations that would
         prevent or inhibit it from fulfilling all of its obligations under this
         Agreement. Any and all obligations of Calypte to provide the Products,
         as well as any technical assistance, and any and all obligations of
         Otsuka with respect to obtaining governmental approval or
         commercialization of the Products, to the extent affected by U.S.
         Export Regulations, will be subject in all respects to such U.S. Export
         Regulations, which may from time to time govern the license and
         delivery of technology and products abroad by persons subject to the
         jurisdiction of the United States, including the Export Administration
         Act of 1979, as amended, any successor legislation, and the Export
         Administration Regulations issued by the Department of Commerce,
         International Trade Administration, or Office of Export Licensing.
         Calypte shall notify Otsuka of any export and reexport restrictions set
         forth in the export license (if necessary) for every Product shipped to
         Otsuka, and Otsuka will comply with such restrictions to the extent
         applicable. Without in any way limiting the provisions of


                                       67
   72
         this Agreement, Otsuka agrees that unless prior authorization is
         obtained from the Office of Export Licensing (if necessary), it will
         not export, reexport, or transship, directly or indirectly, to country
         groups Q, S, W, Y, or Z (as defined in the Export Administration
         Regulations), or Afghanistan or the People's Republic of China (which
         does not include Taiwan) any of the technical data disclosed to Otsuka
         or the direct product of such technical data, if the Export
         Administration Regulations prohibit such export, reexport or
         transshipment, or otherwise contravene the U.S. Export Regulations in
         effect from time to time, to the extent applicable to Otsuka. To the
         extent the U.S. Export Regulation described here affect any Countries
         in the Otsuka Territory, Otsuka shall be excused from any obligation to
         seek regulatory approval for the Products in such Countries and to
         commercialize the Products in such Countries.

12.18    Independent Contractors.

         The relationship of the parties established by this Agreement is that
         of independent contractors, and nothing contained in this Agreement
         will be construed (i) to give either party the power to direct or
         control the day to day activities of the other or (ii) to constitute
         the parties as partners, joint venturers, co-owners or otherwise as
         participants in a joint or common undertaking. Without limiting
         Calypte's obligations hereunder, all sales and other agreements between
         Otsuka and its customers are Otsuka's exclusive responsibility and will
         not affect Calypte's obligations under this Agreement.

12.19    Manufacture in Japan.

         Calypte will consider, and discuss in good faith with Otsuka,
         permitting Otsuka to manufacture Product(s) on

                                       68
   73
         behalf of Calypte on mutually agreeable terms and conditions.

IN WITNESS WHEREOF, the undersigned are duly authorized to execute this 
Agreement on behalf of Calypte and Otsuka as applicable.

CALYPTE BIOMEDICAL CORPORATION OTSUKA PHARMACEUTICAL CO., LTD.


By:     /s/ BILL BOEGER                By:     /s/ AKIHIKO OTSUKA
        --------------------------             ---------------------------

Name:   BILL BOEGER                    Name:   AKIHIKO OTSUKA
        --------------------------             ---------------------------

Tit1e:  PRESIDENT AND CEO              Title:  PRESIDENT
        --------------------------             ---------------------------

Date:   AUGUST 4, 1994                 Date:   AUGUST 7, 1994
        --------------------------             ---------------------------



                                       69
   74
                                    Exhibit A

                          List of Calypte Patent Rights

Foreign Patents Issued

Self Contained Multi-Immunoassay Diagnostic Systems- Patent No. 225 771

Self Contained Multi-Immunoassay Diagnostic Systems- Patent No. 88/5777


U.S. Patents Pending

Self Contained Multi-Immunoassay Diagnostic Systems-Serial No. 07/307,361


License Agreements

New York University-Patents Nos. 4,865,966 and 5,122,446
Detection of antibodies to human immunodeficiency virus (HIV) in urine

Repligen Corporation-Patent Application Nos. 836,196; 091,481; and 941,111
HIV-1 gp 160

Cambridge Biotech- Patent No. 4,725,669
"Assay for Detecting Infection by Human T-Cell Lymphotrophic Virus-III"

Stanford University- Patent Nos. 4,237,224; 4,486,464; and 4,740,470
Recombinant DNA

Texas A&M University System- Patents Nos. 4,745,051 and 4,879,236
Recombinant baculovirus expression vector system (BEVS)
   75
                                    EXHIBIT B

                                   E-1 SYSTEM

The Calypte E-1 System and procedures for use are further described in U.S. 
Patent Application SELF CONTAINED MULTI-IMMUNOASSAY DIAGNOSTIC SYSTEMS, the 
relevant portion of which is attached below.
   76
                  E-I SYSTEM - PENDING CLAIMS AS OF MAY 12,1994

         29.  (Thrice amended) A kit f or detecting the presence of a target 
human antibody to human immunodeficiency virus (HIV) in a urine sample 
comprising

              a) a treatment buffer comprising non-immune sera and about 0. 01%
to about 0.5% (w/v) of a plurality of solid phase particles from about 0.5 
microns to about 10 microns in diameter, each particle coated with goat, 
bovine, or horse immunoglobulin antibodies, the non-immune sera comprising 3% 
bovine serum, 3% goat serum, and 3% horse serum;

              b) a labelled reagent comprising an enzyme label conjugated to an
anti-human immunoglobulin antibody;

              c) a substrate specific for the enzyme label; and

              d) a reagent HIV antigen.

         34. (Twice amended) A buffer comprising non-immune sera and about 0.01%
to about 0.5% (w/v) of a plurality of solid phase particles from about 0.5 
microns to about 10 microns in diameter, each particle coated with goat, bovine,
or horse immunoglobulin antibodies, the non-immune sera comprising 3% bovine 
serum, 3% goat serum, and 3% horse serum.

         37. (Thrice amended) A method for detecting the presence of a target 
human antibody to HIV in a urine sample, said method comprising:

   77
              a) adding a treatment buffer to the sample, which buffer 
comprises non-immune sera and 0.01% to 0.5% (w/v) of a plurality of solid phase
particles from about O.5 microns to about 10 microns in diameter, each 
particle coated with goat, bovine, or horse immunoglobulin antibodies, the 
non-immune sera comprising 3% bovine serum, 3% goat serum, and 3% horse serum;
and

              b) contacting the sample with a reagent HIV antigen to form an 
antigen-antibody complex containing the target human antibody and the HIV 
antigen;

              c) contacting the antigen-antibody complex with an enzyme labeled
anti-human immunoglobulin antibody that specifically binds to the target human
antibody; and 

              d) detecting the presence of the bound label as an indication of 
the presence of the target antibody in the urine sample.

         40. (Thrice amended) The method of claim 37 wherein the antibody to HIV
specifically binds glycoprotein gp160, gp120 or gp41, or protein p24.

         42. (Thrice amended) A method of detecting an HIV antibody in a saliva,
urine, or whole or fractionated blood sample from a human subject, said method 
comprising:

              a) contacting the sample with a recombinant HIV glycoprotein under
conditions such that the glycoprotein specifically binds to any HIV antibody 
present in the sample to form a complex;
   78
              b) contacting the complex with an enzyme labeled anti-human 
immunoglobulin antibody which specifically binds and labels the complex to form
a labeled complex; and

              c) detecting the presence of labeled complex and thereby the 
presence of HIV antibody in the sample wherein a treatment buffer is added to
the sample before, or simultaneous with, contacting the sample with the
glycoprotein, said treatment buffer comprising non-immune sera and about 0.01%
to O.5% (w/v) of a plurality of solid phase particles from about 0.5 microns to
about 10 microns in diameter, each particle coated with goat, bovine, or horse
immunoglobulin antibodies, the non-immune sera comprising 3% bovine serum, 3%
goat serum, and 3% horse serum.


         48. (Twice amended) A method for detecting in a sample from a human 
subject the presence of a target human antibody to HIV which specifically binds
an HIV viral antigen, said method comprising:

              a) adding to the sample a treatment buffer comprising non-immune 
sera and about 0.01% to about 0.5% (w/v) of a plurality of solid phase particles
from about 0.5 microns to about 10 microns in diameter, each particle coated
with goat, bovine, or horse immunoglobulin antibodies, the non-immune sera
comprising 3% bovine serum, 3% goat serum, and 3% horse serum;

              b) using a test strip comprising:
 
                   i)   a solid support;

                   ii)  said HIV viral antigen bound to a first discrete area on
the solid support;
   79
                   iii) a non-target human antibody bound to a second discrete 
area on the solid support as a positive control; and

                   iv)  a negative control which will not specifically bind 
target human antibody or antihuman antibody bound to a third discrete area on
the solid support;

              c) contacting the treated sample with the test strip under 
conditions such that the HIV viral antigen bound to the test strip specifically
binds with any target human antibody present in the treated sample;

              d) washing the test strip to remove unbound treated sample;

              e) contacting the resulting test strip with enzyme labeled 
antihuman antibodies which specifically bind to any target human antibodies
bound to, or on, the test strip;

              f) detecting the presence of labeled antibodies and thereby the 
presence of target human antibodies in the sample; and

              g) verifying the correctness of the detection by determining that
the positive control is labeled and the negative control is not labeled.

         54.  (Twice amended) The method of claim 48 wherein the coated solid 
phase particles are prepared using particles individually coated with the
non-immune sera from either goat, bovine, or horse.
   80
         55.  (Twice amended) A method for detecting in a sample from a human 
subject the presence of a target human antibody to HIV which specifically binds
an HIV viral antigen, said method comprising:

              a) adding to the sample a treatment buffer comprising non-immune 
sera and about 0.01% to about 0.5% (w/v) of a plurality of solid phase particles
from about 0.5 microns to about 10 microns in diameter, each particle coated
with goat, bovine, or horse immunoglobulin antibodies, the non-immune sera
comprising 3% bovine serum, 3% goat serum, and 3% horse serum;

              b) using a test strip comprising:

                   i)   wells used as a solid support;

                   ii)  said HIV viral antigen bound to discrete areas on the 
solid support;

              c) contacting the treated sample with the test strip under 
conditions such that the HIV viral antigen bound to the test strip specifically
binds with any target human antibody present in the treated sample;

              d) washing the test strip to remove unbound treated sample;

              e) contacting the resulting test strip with enzyme labeled 
antihuman antibodies which specifically bind to any target human antibodies
bound to, or on, the test strip; and

              f) detecting the presence of labeled antibodies and thereby the 
presence of target human antibodies in the sample
   81
         58.  The method of claim 55 wherein the HIV viral antigen is 
recombinant gp 160.
   82
                                    EXHIBIT C

                             PART NUMBER MASTER LIST



--------------------------------------------------------------------------------
PART NUMBER   TITLE OF DOCUMENT
================================================================================
                                                                     
180000        Preparation of the Master Cell Seed Bank (MCSB)
--------------------------------------------------------------------------------
180001        Preparation of the Working Cell Seed Bank (WCSB)
--------------------------------------------------------------------------------
180002        Preparation of the Master Virus Seed Bank (MVSB)
--------------------------------------------------------------------------------
180003        Preparation of the Working Virus Seed Bank (WVSB)
--------------------------------------------------------------------------------
200000        Preparation of 1OX TBS, 1% azide
--------------------------------------------------------------------------------
200002        Preparation of 1% Bovine lgG Coated Beads
--------------------------------------------------------------------------------
200003        Preparation of 1 % Equine lgG Coated Beads
--------------------------------------------------------------------------------
200004        Preparation of 1% Goat IgG Coated Beads
--------------------------------------------------------------------------------
200005        Preparation of BSA-TBS, 0.1% azide
--------------------------------------------------------------------------------
200006        Preparation of Positive Pool Stock
--------------------------------------------------------------------------------
200007        Preparation of Grace's Complete Media with 10% FBS
--------------------------------------------------------------------------------
200008        Preparation of Deionized 8M Urea
--------------------------------------------------------------------------------
200009        Preparation of Lysis Buffer
--------------------------------------------------------------------------------
200010        Preparation of Extraction Buffer
--------------------------------------------------------------------------------
200011        Preparation of Lentil Lectin Buffer
--------------------------------------------------------------------------------
200013        Preparation of Gel Filtration Buffer
--------------------------------------------------------------------------------
200015        Preparation of Lentil Lectin Regeneration Buffer A
--------------------------------------------------------------------------------
200016        Preparation of Lentil Lectin Regeration Buffer B
--------------------------------------------------------------------------------
200017        Preparation of Lentil Lectin Storage Buffer
--------------------------------------------------------------------------------
200018        Preparation of Sartocon Cleaning Solution
--------------------------------------------------------------------------------
200020        Preparation of Buffer Exchanged gp160 Urea Extract
--------------------------------------------------------------------------------
200021        Preparation of Dialyzed gp16O Lentil Lectin Pool
--------------------------------------------------------------------------------
200022        Preparation of gp160 Fraction Pool
--------------------------------------------------------------------------------
200023        Preparation of gp160 Cell Paste
--------------------------------------------------------------------------------
200024        Preparation of Phosphate-EDTA Buffer
--------------------------------------------------------------------------------
200025        Preparation of 2 mg/ml chymostatin
--------------------------------------------------------------------------------
200026        Expansion of Sf9 Cells for the production of gp160
--------------------------------------------------------------------------------
200027        Heat Inactivation of Fetal Bovine Serum
--------------------------------------------------------------------------------
200028        Preparation of Wash Buffer
--------------------------------------------------------------------------------




                                     3/28/94
   83
                             PART NUMBER MASTER LIST



--------------------------------------------------------------------------------
PART NUMBER   TITLE OF DOCUMENT
================================================================================
               
200029        Preparation of 0.15M NaCl
--------------------------------------------------------------------------------
200030        Preparation of 0.5M EDTA
--------------------------------------------------------------------------------
200031        Preparation of Phosphate Flushing Buffer
--------------------------------------------------------------------------------
300001        Preparation of Conjugate Diluent
--------------------------------------------------------------------------------
300002        Preparation of Negative Control
--------------------------------------------------------------------------------
300003        Preparation of Positive Control
--------------------------------------------------------------------------------
300004        Preparation of Sample Buffer
--------------------------------------------------------------------------------
300005        Preparation of Substrate Diluent
--------------------------------------------------------------------------------
300006        Preparation of Stop Solution
--------------------------------------------------------------------------------
300007        Preparation of Wash Solution
--------------------------------------------------------------------------------
300009        Preparation of Conjugate Concentrate
--------------------------------------------------------------------------------
300010        Final Processing of gp16O
--------------------------------------------------------------------------------
300011        Combining of gp160 Lots
--------------------------------------------------------------------------------
400001        Filling of Conjugate Concentrate
--------------------------------------------------------------------------------
400002        Fillinq of Conjugate Diluent
--------------------------------------------------------------------------------
400003        Filling of Negative Control
--------------------------------------------------------------------------------
400004        Filling of Positive Control
--------------------------------------------------------------------------------
400005        Filling of Sample Buffer
--------------------------------------------------------------------------------
400007        Filling of Substrate Diluent
--------------------------------------------------------------------------------
400008        Filling of Stop Solution
--------------------------------------------------------------------------------
400009        Fillinq of Wash Solution
--------------------------------------------------------------------------------
500000        Coating, Packaging and Labeling of Microwell Strips
--------------------------------------------------------------------------------
500001        Labeling of Conjugate Concentrate
--------------------------------------------------------------------------------
500002        Labeling of Conjugate Diluent
--------------------------------------------------------------------------------
500003        Labeling of Negative Control
--------------------------------------------------------------------------------
500004        Labeling of Positive Control
--------------------------------------------------------------------------------




                                     3/28/94
   84
                             PART NUMBER MASTER LIST



--------------------------------------------------------------------------------
PART NUMBER   TITLE OF DOCUMENT
================================================================================
                                               
500005        Labeling of Sample Buffer
--------------------------------------------------------------------------------
500006        Packaging and Labeling of Substrate tablets (25)
--------------------------------------------------------------------------------
500007        Labeling of Substrate Diluent
--------------------------------------------------------------------------------
500008        Labeling of Stop Solution
--------------------------------------------------------------------------------
500009        Labeling of Wash Solution
--------------------------------------------------------------------------------
500013        Packaging and Labeling of Substrate tablets (15)
--------------------------------------------------------------------------------
600000        Final Product Packaging (5 plate), HIV-1 Urine EIA
--------------------------------------------------------------------------------
600001        Final Product Packaging (2 plate), HIV-1 Urine EIA
--------------------------------------------------------------------------------




                                     3/28/94
   85
                                    EXHIBIT D



                                ESCROW AGREEMENT



                        (To be supplied at a later date)
   86
                                    EXHIBIT E

                                 SPECIFICATIONS

When performed to the manufacturer's instructions, the Product will meet or
exceed the assay validity criteria and the expected performance claims which are
printed in the then current Package Insert for the duration of the Product's
life as indicated by the expiration date on the Product labels.

Calypte will provide to Otsuka the Package Insert as approved by the FDA and any
subsequent replacements within 30 days of its approval by the FDA.

In addition, the Product will meet the following criteria:

O.D.

         Negative Control:   The average O.D. (n=5) tested has to be less than
                             0.18.

         Positive Control:   The average O.D. (n=5) tested has to be within the
                             range of the mean +/- 20% (1.546-2.319).
         
         Normal Urine:       The average O.D. (n=5) tested has to be less than
                             cutoff point (negative control O.D. + 0.18).
         
         P-Control:          The average O.D. (n=5) tested has to be within the
                             range of the mean +/- 30% (0.914-1.699).
        
Both Otsuka and Calypte must use the same supply of the Normal Urine and
P-Control in order to verify the specification.

C.V.%      

         Positive Control:   The C.V.(%) of the O.D. (n=5) tested has to be less
         than 15.0%

         P-Control:          The C.V.(%) of the O.D. (n=5) tested has to be less
         than 15.0%.

SAMPLING FREQUENCY

         Kits corresponding to 2-5% of the total number of kits (each lot) 
         received by or on behalf of Otsuka every time will be selected randomly
         and tested. All the test results of each kit selected have to clear the
         specifications.
   87
                                      -2-

APPEARANCE OF KIT

The appearance of all the kit contents such as vials and labels including kit
boxes must show no evidence of leakage, damage or obvious cosmetic defects.

COMPONENTS

Components will be tested and evaluated according to the performance criteria
described above.

   CALYPTE BIOMEDICAL                  OTSUKA PHARMACEUTICAL CO.


 By:                                   By:
      /s/ Bill Beager                          /s/ Hideji Nononura
     ------------------------             -------------------------- 

Date:                                  Date:
      8-4-94                                8-7-94
     ------------------------               ------------------------ 
   88
                                    EXHIBIT F

                         CALYPTE MANUFACTURING CAPACITY



1.       Berkeley Manufacturing Facility

         Maximum capacity is       plates or         tests per month

2.       Harbor Bay Manufacturing Facility

         Maximum capacity is        plates or           tests per month

Confidential portion has been omitted and filed separately with the Commission