UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K


                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


         Date of Report (Date of Earliest Event Reported): June 3, 2005


                            IRIS INTERNATIONAL, INC.
             (Exact name of registrant as specified in its charter)


          DELAWARE                      1-11181                  94-2579751
(State or other jurisdiction          (Commission             (I.R.S. Employer
     of incorporation)                File Number)           Identification No.)


                                9172 ETON AVENUE
                              CHATSWORTH, CA 91311
                (Address of Principal Executive Offices/Zip Code)


                                 (818) 709-1244
              (Registrant's telephone number, including area code)


         Check the  appropriate  box below if the Form 8-K filing is intended to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (SEE General Instruction A.2. below):

         |_|      Written   communications   pursuant  to  Rule  425  under  the
                  Securities Act (17 CFR 230.425)

         |_|      Soliciting material pursuant to Rule 14a-12 under the Exchange
                  Act (17 CFR 240.14a-12)

         |_|      Pre-commencement  communications  pursuant  to  Rule  14d-2(b)
                  under the Exchange Act (17 CFR 240.14d-2(b))

         |_|      Pre-commencement  communications  pursuant  to Rule  13e-4(c))
                  under the Exchange Act (17 CFR 240.13e-4c))





ITEM 2.01. COMPLETION OF ACQUISITION OR DISPOSITION OF ASSETS.

         QUIDEL ACQUISITION

         On June 3, 2005,  our indirect  wholly-owned  subsidiary,  Blitz 05-047
GmbH  ("IRIS  DEUTSCHLAND"),   purchased  certain  assets  and  assumed  certain
liabilities  of  Quidel   Corporation   ("QUIDEL")  and  Quidel's   wholly-owned
subsidiary Quidel Deutschland GmbH ("QUIDEL  DEUTSCHLAND") pursuant to the terms
of an Asset Purchase Agreement (the "ASSET PURCHASE AGREEMENT") by and among us,
IRIS Deutschland,  Quidel and Quidel Deutschland, dated April 26, 2005. Pursuant
to the  Asset  Purchase  Agreement  IRIS  Deutschland  acquired  the  urinalysis
business  of Quidel,  including  technology  and  inventory,  for  approximately
$500,000  plus the  assumption  of  certain  current  liabilities.  Prior to the
execution of the Asset  Purchase  Agreement,  no material  relationship  existed
between us or any of our affiliates,  and Quidel or any of its  affiliates.  The
press release announcing the closing of the purchase transaction is furnished as
Exhibit 99.1 to this report and is incorporated herein by reference.

ITEM 9.01  FINANCIAL STATEMENTS AND EXHIBITS

(a)      Financial  Statements of Business  Acquired.  The financial  statements
         required by this item are not included  with this initial  report.  The
         required  financial  statements  will be filed by  amendment as soon as
         practicable,  but not later  than 71 days  after the date this  Current
         Report on Form 8-K was required to be filed.

(b)      Pro Forma Financial  Information.  The pro-forma  financial  statements
         required by this item are not included  with this initial  report.  The
         required pro-forma  financial  statements will be filed by amendment as
         soon as  practicable,  but not later  than 71 days  after the date this
         Current Report on Form 8-K was required to be filed.

 (c)     Exhibits.

         The following exhibits are filed herewith:

         EXHIBIT
         NUMBER   DESCRIPTION
         -------  -----------

         2.1      Asset  Purchase  Agreement  by and between by and between IRIS
                  International, Inc., Blitz 05-047 GmbH, Quidel Corporation and
                  Quidel Deutschland GmbH, dated April 26, 2005.(1)

         99.1     Press   Release   dated  June  6,  2005,   published  by  IRIS
                  International,  Inc.  announcing  the  acquisition  of  Quidel
                  Corporation's urinalysis business.

- ----------
(1)      Pursuant to Item  601(b)(2) of  Regulation  S-K,  the  schedules to the
         Asset Purchase Agreement have been omitted.  The Registrant  undertakes
         to  supplementally  furnish  a copy  of the  omitted  schedules  to the
         Securities and Exchange Commission upon request.


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                                    SIGNATURE

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                         IRIS INTERNATIONAL, INC.



Date:    June 8, 2005                    By:      /s/ Martin G. Paravato
                                                  ------------------------------
                                                  Martin G. Paravato
                                                  Chief Financial Officer


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                                  EXHIBIT INDEX

EXHIBIT
NUMBER            DESCRIPTION
- -------           -----------

2.1               Asset  Purchase  Agreement  by and between by and between IRIS
                  International, Inc., Blitz 05-047 GmbH, Quidel Corporation and
                  Quidel Deutschland GmbH, dated April 26, 2005.(1)

99.1              Press   Release   dated  June  6,  2005,   published  by  IRIS
                  International,  Inc.  announcing  the  acquisition  of  Quidel
                  Corporation's urinalysis business.

- ----------
(1)      Pursuant to Item  601(b)(2) of  Regulation  S-K,  the  schedules to the
         Asset Purchase Agreement have been omitted.  The Registrant  undertakes
         to  supplementally  furnish  a copy  of the  omitted  schedules  to the
         Securities and Exchange Commission upon request.


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