EXHIBIT 10.9

            NEITHER THIS WARRANT NOR THE SHARES OF STOCK  ISSUABLE  UPON
        EXERCISE HEREOF HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF
        1933, AS AMENDED. NO SALE, TRANSFER OR OTHER DISPOSITION OF THIS
        WARRANT OR SAID SHARES MAY BE EFFECTED  WITHOUT (I) AN EFFECTIVE
        REGISTRATION  STATEMENT  RELATED THERETO,  OR (II) AN OPINION OF
        COUNSEL, REASONABLY SATISFACTORY TO COUNSEL TO THE COMPANY, THAT
        AN EXEMPTION FROM REGISTRATION UNDER SAID ACT IS AVAILABLE.

    Warrant                                                       No. of
    No. 1                     STOCK PURCHASE WARRANT       Shares 10,000
       ---                                                        ------
                  To Subscribe for and Purchase Common Stock of

                             BOSTON BIOMEDICA, INC.

        THIS CERTIFIES that, for value received,  Worcester  County  Institution
for  Savings,  a  Massachusetts  savings  bank  (together  with  any  subsequent
transferees of all or any portion of this Warrant,  the "Holder"),  is entitled,
upon the terms and subject to the conditions hereinafter set forth, to subscribe
for and  purchase  from Boston  Biomedica,  Inc.,  a  Massachusetts  corporation
(hereinafter called the "Company"), at the price of $20.00 per share (subject to
adjustment as provided in Section 6, the "Warrant Purchase Price"), up to 10,000
fully paid and  non-assessable  shares of the Company's  common stock,  $.01 par
value per share (the "Shares"),

        1.  Definitions.  As used  herein  the  following  terms  shall have the
following meanings:

        "Act" means the Securities Act of 1933 as amended,  or a similar Federal
statute and the rules and  regulations of the Commission  issued under that Act,
as they each may, from time to time, be in effect.

        "Commission" means the Securities and Exchange Commission,  or any other
Federal  agency at the time  administering  the  securities  laws of the  United
States.

        "Registration  Statement"  means a registration  statement (other than a
registration  statement  on Form S-8 solely  with  respect to  employee  benefit
plans,  or on Form S-4  solely  with  respect to Rule 145  transactions,  or any
successor  form or forms used for the purpose  specified by such forms) filed by
the Company with the Commission  under the Act for a public offering and sale of
securities of the Company.

        "Shares" means the 10,000 shares of the Company's Common Stock issued or
issuable to the Holder upon the exercise of this Warrant and any other shares of
Common Stock of the Company issued with respect to such shares (because of stock
splits,   stock  dividends,   reclassifications,   recapitalizations,   mergers,
consolidations,   or  similar  events);  provided,   however,  that  any  shares
previously  sold by the Holder to the public  pursuant  to a  registered  public
offering  or Rule 144 under the Act shall cease to be within the  definition  of
"Shares" as used herein.



                                      -1-


        2. Purchase Rights.  The purchase rights represented by this Warrant are
exercisable by the Holder in accordance with the following provisions:

        (a) subject to the provisions of subparagraph  (b) hereof,  this Warrant
is  exercisable,  in  whole  or in  part,  at any  time  and  from  time to time
commencing on the date hereof and ending at 5:00 p.m. on December 1, 2001.

        (b) the Holder's  right to exercise this Warrant shall vest with respect
to the indicated percentage of the total number of Shares purchaseable hereunder
at the expiration of the indicated periods from the date hereof:

Years Expired From                                   Percentage of Total Shares
 Date of Issuance                                   of Common Stock Purchaseable
 ----------------                                   ----------------------------

Less than 1 year                                                50%

1 or more and less than 2 years                               62 1/2%

2 or more and less than 3 years                                 75%

3 or more and less than 4 years                               87 1/2%

4 or more years                                                 100%

        3. Exercise of Warrant.  Subject to Section 2 above, the purchase rights
represented by this Warrant may be exercised,  in whole or in part and from time
to time, by (a) the  surrender of this Warrant and the duly  executed  Notice of
Exercise (the form of which is attached as Exhibit A) at the principal office of
the Company and by the payment to the Company,  by check,  of an amount equal to
the then applicable Warrant Purchase Price per share multiplied by the number of
Shares then being  purchased,  or (b) if in connection with a registered  public
offering of the Company's securities, the surrender of this Warrant and the duly
executed  Notice of Exercise  (the form of which is attached as Exhibit  A-1) at
the  principal  office of the  Company  together  with  notice  of  arrangements
reasonably  satisfactory  to the Company  for  payment to the Company  either by
check or from the  proceeds  received  from the sale of Shares to be sold by the
Holder in such public offering of an amount equal to the then applicable Warrant
Purchase  Price  per  share  multiplied  by the  number  of  Shares  then  being
purchased.  Upon  exercise,  the Holder  shall be entitled to receive,  within a
reasonable time, a certificate or  certificates,  issued in the Holder's name or
in such name or names as the  Holder  may  direct,  for the  number of Shares so
purchased.  The Shares so purchased shall be deemed to be issued as of the close
of business on the date on which this Warrant shall have been exercised.

        4. Shares to be Issued;  Reservation  of Shares.  The Company  covenants
that all shares that may be issued  upon the  exercise  of the  purchase  rights
represented   by  this  Warrant  will,   upon


                                      -2-


issuance,  be fully paid and non-assessable,  and free from all taxes, liens and
charges with respect to the issue  thereof.  During the period  within which the
purchase rights represented by the Warrant may be exercised, the Company will at
all times  have  authorized  and  reserved,  for the  purpose of  issuance  upon
exercise of the purchase rights represented by this Warrant, a sufficient number
of  shares  of its  Common  Stock  to  provide  for the  exercise  of the  right
represented by this Warrant.

        5.  No Fractional Shares.  No fractional shares shall be issued upon the
exercise of this Warrant. In lieu thereof, a cash payment shall be made equal to
such  fraction  multiplied  by the fair  market  value of such  shares of Common
Stock, as determined in good faith by the Company's Board of Directors.

        6. Adjustments of Warrant Purchase Price and Number of Shares.

        (a) If there  shall be any  change in the  Common  Stock of the  Company
through merger, consolidation, reorganization, recapitalization, stock dividend,
stock  split  or  other  change  in the  corporate  structure  of  the  Company,
appropriate  adjustments  shall be made by the Board of Directors of the Company
(or if the Company is not the surviving corporation in any such transaction, the
Board of Directors of the surviving  corporation)  in the  aggregate  number and
kind of shares  subject to this  Warrant,  and the number and kind of shares and
the price per share then applicable to shares covered by the unexercised portion
of this Warrant.

        (b) Upon each adjustment under subparagraph (a) above, the Company shall
give prompt  written  notice  thereof  addressed to the Holder at the address of
such holder as shown on the records of the Company (if to the  original  holder,
to the attention of the Commercial  Loan  Department),  which notice shall state
the Warrant  Purchase Price  resulting from such  adjustment and the increase or
decrease,  if any,  in the number of shares of Common  Stock  issuable  upon the
exercise  of this  Warrant,  setting  forth in  reasonable  detail the method of
calculation and the facts upon which such calculation is based.

        7.      Piggyback Registration Rights.  The Company agrees as follows:

        (a) The rights  granted  to the Holder in Section  7(b) below are wholly
subordinated,  junior and subject to the exercise of certain registration rights
granted to G & G Diagnostics Limited Partnership I under a certain  Registration
Rights Agreement dated June 5, 1990 (the "G&G Registration Rights Agreement"), a
copy of which shall be furnished to the Holder upon written  request and without
charge.

        (b) If the Company shall  determine to register any shares of its Common
Stock  under  the Act and in  connection  therewith  the  Company  may  lawfully
register  any of the Shares,  the Company  will  promptly  give  written  notice
thereof to the  Holder.  Upon the


                                      -3-


written  request of the Holder  within 30 days after  receipt of any such notice
from the Company, the Company will, except as herein provided,  cause all of the
Shares which the Holder has  requested to be  registered  to be included in such
Registration Statement,  all to the extent requisite to permit the sale or other
disposition of the Shares. However nothing herein shall prevent the Company from
at any time abandoning or delaying any registration.

        (c) If any  shares  registered  pursuant  to this  Section  7  shall  be
included in an underwritten public offering in whole or in part, the Company may
require that the Shares  requested  for  inclusion  hereunder be included in the
underwriting on the same terms and conditions as the securities  otherwise being
sold through the underwriters. If and in the event that the managing underwriter
of such public  offering  shall be of the opinion  that  inclusion of all of the
Shares would adversely  affect the marketing of the securities to be sold by the
Company  therein,  then the number of Shares  otherwise  to be  included  in the
underwritten  public offering may be reduced on a pro rata basis with the shares
proposed  to be  included  in such  offering  by any other  selling  shareholder
(exclusive of the Company and the holder or holders of shares subject to the G&G
Registration Rights Agreement).  No Shares will be registered under this Section
7 if the  holder or holders of shares  subject  to the G&G  Registration  Rights
Agreement  request the  registration  of all but do not have all of their shares
subject to said G&G Registration Rights Agreement so registered.

        8.  Registration Procedures.  If and whenever the Company is required by
the provisions of Section 7 to effect the  registration  of the Shares under the
Act, the Company will:

        (a) prepare and file with the Commission a  Registration  Statement with
respect to such securities,  and use its best efforts to cause such Registration
Statement to become and remain  effective  for such period as may be  reasonably
necessary to effect the sale of such securities, not to exceed nine months;

        (b)  prepare  and  file  with the  Commission  such  amendments  to such
Registration  Statement and supplements to the prospectus  contained  therein as
may be necessary to keep such Registration  Statement  effective for such period
as may be reasonably  necessary to effect the sale of such Shares, not to exceed
nine months;

        (c) furnish to the Holder  participating in such registration and to the
underwriters of the securities being registered such reasonable number of copies
of the Registration Statement, preliminary prospectus, final prospectus and such
other  documents  as such  underwriters  may  reasonably  request  in  order  to
facilitate the public offering of such securities;

        (d) use its best efforts to register or qualify the  securities  covered
by such  Registration  Statement under the state  securities or blue sky laws of
such jurisdictions as the Holder


                                      -4-


may  reasonably  request  within 20 days  following the original  filing of such
Registration  Statement,  except that the  Company  shall not for any purpose be
required to execute a general  consent to service of process or to qualify to do
business  as a foreign  corporation  in any  jurisdiction  wherein  it is not so
qualified;

        (e) notify the Holder promptly after it shall receive notice thereof, of
the time when such  Registration  Statement has become effective or a supplement
to any prospectus forming a part of such registration statement has been filed;

        (f) notify the Holder  promptly of any request by the Commission for the
amending or  supplementing of such  Registration  Statement or prospectus or for
additional information;

        (g) prepare and promptly file with the  Commission  and promptly  notify
the Holder of the filing of such  amendment or supplement  to such  Registration
Statement  or  prospectus  as may be  necessary  to correct  any  statements  or
omissions  if, at the time when a  prospectus  relating  to such  securities  is
required to be  delivered  under the Act,  any event shall have  occurred as the
result of which any such  prospectus  or any other  prospectus as then in effect
would  include  an  untrue  statement  of a  material  fact or omit to state any
material  fact  necessary to make the  statements  therein,  in the light of the
circumstances in which they were made, not misleading;

        (h) advise the Holder  promptly  after it shall receive notice or obtain
knowledge  thereof,  of  the  issuance  of any  stop  order  by  the  Commission
suspending the effectiveness of such Registration Statement or the initiation or
threatening of any proceeding for that purpose and promptly use its best efforts
to prevent the  issuance of any stop order or to obtain its  withdrawal  if such
stop order should be issued; and

        (i) furnish on the effective date of the  Registration  Statement to the
Holder and any  underwriters,  at the closing  provided for in the  underwriting
agreement,  an  opinion  of  counsel  for the  Company  and a  letter  from  the
independent  certified public accountants for the Company, in form and substance
customary for similar offerings;

        9.  Expenses.  All expenses in connection  with,  or incidental  to, the
preparation  and  filing of any  Registration  Statement  pursuant  to Section 7
hereof,  any registration or qualification  under securities or blue sky laws of
states in which the  offering  will be made,  and any filing fee of the National
Association  of Securities  Dealers,  Inc.  ("NASD")  relating to such offering,
shall be borne by the Company; provided, however, that the Holder shall bear its
pro rata share of the underwriting  discount and commissions and transfer taxes,
all fees and disbursements of Holder's  counsel,  and, to the extent required by
applicable state securities laws and NASD rules and regulations,  all legal fees
and  disbursements and other


                                      -5-


expenses  of  complying   with  state   securities  or  blue  sky  laws  of  any
jurisdictions  in  which  the  Shares  to be  offered  are to be  registered  or
qualified.

        10.     Indemnification.

        (a) The Company  will  indemnify  and hold  harmless  the Holder and any
underwriter (as defined in the Act) for such Holder and each person, if any, who
controls such Holder or such underwriter within the meaning of the Act, from and
against,   and  will  reimburse  such  Holder  and  each  such  underwriter  and
controlling  person with respect to, any and all loss, damage,  liability,  cost
and expense to which such Holder or any such  underwriter or controlling  person
may become subject under the Act or otherwise,  insofar as such losses, damages,
liabilities,  costs or expenses  are caused by any untrue  statement  or alleged
untrue statement of any material fact contained in any  Registration  Statement,
any  prospectus  contained  therein or any amendment or supplement  thereto,  or
arise out of or are based upon the omission or alleged omission to state therein
a  material  fact  required  to be  stated  therein  or  necessary  to make  the
statements  therein,  in light of the circumstances in which they were made, not
misleading;  provided,  however, that the Company will not be liable in any such
case to the extent that any such loss, damage, liability, cost or expense arises
out of or is based upon an untrue  statement  or  alleged  untrue  statement  or
omission or alleged omission so made in conformity with information furnished by
such Holder, such underwriter or such controlling person in writing specifically
for use in the preparation thereof.

        (b) The  Holder  will  indemnify  and hold  harmless  the  Company,  its
directors and  officers,  any  underwriter  and any  controlling  person of such
underwriter  from and against,  and will  reimburse the Company,  underwriter or
controlling person with respect to, any and all loss, damage, liability, cost or
expense to which the Company,  any underwriter or any controlling person thereof
may become subject under the Act or otherwise,  insofar as such losses, damages,
liabilities,  costs or  expenses  are  caused by any  untrue or  alleged  untrue
statement of any material  fact  contained in any  Registration  Statement,  any
prospectus  contained therein or any amendment or supplement  thereto,  or arise
out of or are based upon the omission or the alleged omission to state therein a
material fact required to be stated  therein or necessary to make the statements
therein,  in light of the circumstances in which they were made, not misleading,
in each case to the extent,  but only to the extent,  that such untrue statement
or alleged  untrue  statement  or  omission or alleged  omission  was so made in
reliance upon written information  furnished by such Holder specifically for use
in the preparation thereof.

        11. Rights and Obligations  Survive  Exercise and Expiration of Warrant.
The rights and  obligations  of the Company and the Holder set forth in Sections
7, 8, 9 and 10 shall survive the exercise and expiration of this Warrant.


                                      -6-


        12. No Rights as Shareholders.  This Warrant does not entitle the Holder
to any voting  rights or other rights as a  shareholder  of the Company prior to
exercise  of this  Warrant  and the  payment  for the shares of Common  Stock so
purchased.  Notwithstanding the foregoing, the Company agrees to transmit to the
Holder such information,  documents and reports as are generally  distributed to
holders of the capital stock of the Company  concurrently  with the distribution
thereof to the shareholders. Upon valid exercise of this Warrant and payment for
the shares of Common  Stock so  purchased  in  accordance  with the terms of the
Warrant,  the  Holder or the  Holder's  designee,  as the case may be,  shall be
deemed a shareholder of the Company.

        13. Sale or Transfer of the Warrant; Legend.  The Warrant and the shares
of Common Stock shall not be sold or  transferred  unless  either (i) they first
shall have been  registered  under the Act, or (ii) the Company first shall have
been furnished with an opinion of legal counsel  satisfactory  to the Company to
the  effect  that  such  sale  or  transfer  is  exempt  from  the  registration
requirements of the Act. Each  certificate  representing  any Warrant shall bear
the legend set out on page 1 hereof.  Each  certificate  representing any Common
Stock shall bear a legend substantially in the following form, as appropriate:

        THE SHARES  REPRESENTED BY THIS  CERTIFICATE  HAVE BEEN ACQUIRED
        FOR  INVESTMENT  AND NOT WITH A VIEW TO, OR IN CONNECTION  WITH,
        THE SALE OR  DISTRIBUTION  THEREOF.  NO SUCH SALE OR DISPOSITION
        MAY BE  EFFECTED  WITHOUT AN  EFFECTIVE  REGISTRATION  STATEMENT
        RELATED  THERETO OR AN OPINION  OF COUNSEL  SATISFACTORY  TO THE
        COMPANY  THAT  SUCH  REGISTRATION  IS  NOT  REQUIRED  UNDER  THE
        SECURITIES ACT OF 1933.

Such Warrant and Shares may be subject to  additional  restrictions  on transfer
imposed under applicable state and federal securities law.

        14. Modifications and Waivers. This Warrant may not be changed,  waived,
discharged or terminated  except by an instrument in writing signed by the party
against which enforcement of the same is sought.

        15. Notices. Any notice, request or other document required or permitted
to be given or delivered to the holder hereof or the Company shall be delivered,
or shall be sent by certified or registered mail, postage prepaid, to the Holder
at its  address  shown on the  books of the  Company  or to the  Company  at the
address indicated therefor on the signature page of this Warrant.

        16.   Loss, Theft, Destruction or Mutilation of Warrant.   The   Company
covenants  with  the  Holder  that  upon  its  receipt  of  evidence  reasonably
satisfactory  to the Company of the loss,  theft,  destruction  or mutilation of
this Warrant or any stock  certificate  and, in the case of any such loss, theft
or destruction,  of an indemnity or security reasonably  satisfactory to it, and
upon reimbursement to the Company of all reasonable


                                      -7-


expenses incidental thereto, and upon surrender and cancellation of this Warrant
or stock  certificate,  if  mutilated,  the Company  will make and deliver a new
Warrant  or stock  certificate,  of like  tenor,  in lieu of the  lost,  stolen,
destroyed or mutilated Warrant or stock certificate.

        17. Representations and Warranties of Holder. By accepting this Warrant,
the Holder  represents  and warrants  that it is acquiring  this Warrant and the
Shares for its own account,  for  investment and not with a view to, or for sale
in  connection  with,  any  distribution  thereof  or any part  thereof.  Holder
represents  and  warrants  that  it is  (a)  experienced  in the  evaluation  of
businesses  similar  to the  Corporation,  (b) is able to fend for itself in the
transactions contemplated by this Warrant, (c) has such knowledge and experience
in financial and business  matters as to be capable of evaluating the merits and
risks of an  investment  in the  Corporation,  (d) has the  ability  to bear the
economic risks of an investment in the Corporation,  (e) has been furnished with
or has had access to such information as is specified in subparagraph  (b)(2) of
Rule 502 promulgated  under the Act and (f) has been afforded the opportunity to
ask questions of and to receive  answers from the  Corporation and to obtain any
additional  information  necessary to make an informed  investment decision with
respect to an investment in the Corporation.

        18. Binding Effect on Successors. This Warrant shall be binding upon any
corporation  succeeding the Company by merger,  consolidation  or acquisition of
all or substantially all of the Company's assets,  and all of the obligations of
the Company  relating to the Shares issuable upon exercise of this Warrant shall
survive the exercise and  termination  of this Warrant and all of the  covenants
and  agreements of the Company shall inure to the benefit of the  successors and
assigns of the Holder.

        19.  Governing Law.  This  Warrant  shall be  construed  and enforced in
accordance with, and the rights of the parties shall be governed by, the laws of
the Commonwealth of Massachusetts.

        IN WITNESS WHEREOF, BOSTON BIOMEDICA, INC. has caused this Warrant to be
executed under seal by its officer thereunto duly authorized.

DATED:  December 1, 1991

                                                BOSTON BIOMEDICA, INC.
CORPORATE
    SEAL
                                                By: ____________________________
                                                    Its President

                                                Address: _______________________

                                                ________________________________



                                      -8-


                                    EXHIBIT A


                               NOTICE OF EXERCISE
                               ------------------


        To:     BOSTON BIOMEDICA, INC.

        1. The  undersigned  hereby elects to purchase  _______ shares of Common
Stock of BOSTON  BIOMEDICA,  INC. pursuant to the terms of the attached Warrant,
and tenders herewith payment of the purchase price of such shares in full.

        2. Please issue a certificate or certificates  representing  said shares
in the name of the  undersigned  or in such other name or names as are specified
below.

        3. The undersigned  represents that the aforesaid shares of Common Stock
are being  acquired for the account of the  undersigned  for  investment and not
with a view to, or for resale in connection with, the  distribution  thereof and
that the undersigned has no present  intention of distributing or reselling such
shares. The undersigned further represents that such shares shall not be sold or
transferred  unless either (1) they first shall have been  registered  under the
Securities  Act of 1933,  as amended,  or (ii) the Company first shall have been
furnished  with an  opinion  of legal  counsel  reasonably  satisfactory  to the
Company to the effect that such sale or transfer is exempt from the registration
requirement.

        4. In the event of partial  exercise,  please  re-issue  an  appropriate
Warrant exercisable into the remaining shares.



                                                 -------------------------------
                                                 (Name)

                                                 -------------------------------
                                                 (Address)

                                                 -------------------------------
                                                 (Signature)

                                                 -------------------------------
                                                 (Date)


                                      -9-


                                   EXHIBIT A-1

                               NOTICE OF EXERCISE
                               ------------------


        To:     BOSTON BIOMEDICA, INC. (the "Company")


        1. Contingent upon and effective  immediately  prior to the closing (the
"Closing") of the Company's  public offering  contemplated  by the  Registration
Statement of Form S_____, filed __________,  19__, the undersigned hereby elects
to purchase  _____ shares of Common Stock of the Company (or such lesser  number
of shares as may be sold on behalf of the  undersigned at the Closing)  pursuant
to the terms of the attached Warrant.

        2. Please deliver to the custodian for the selling  shareholders a stock
certificate representing such ____ shares.

        3.  The  undersigned  has  instructed  the  custodian  for  the  selling
shareholders  to deliver to the Company  $______  from the net  proceeds due the
undersigned from the sale of shares in the aforesaid public offering.


                                                 -------------------------------
                                                 (Signature)

                                                 -------------------------------
                                                 (Date)

                                      -10-