Meridian Diagnostics, Inc.
                                                     Savings and Investment Plan
                                                                        Plan 001
                                                                EIN:  31-0888197
                                                                  1996 Form 5500


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 11-K


                                  ANNUAL REPORT
                        PURSUANT TO SECTION 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


     [X] ANNUAL REPORT PURSUANT TO SECTION 15(D) OF THE SECURITIES EXCHANGE
         ACT OF 1934

                                       OR

     [ ] TRANSITION  REPORT  PURSUANT  TO  SECTION  15(D) OF THE  SECURITIES
         EXCHANGE ACT OF 1934 (NO FEE REQUIRED)


         For the Fiscal Year                                       Commission
       Ended December 31, 1996                                      File No.
                                                                    0-14902

     A.   Full title of the Plan and the address of the Plan, if different  from
          that of the issuer named below:

                           MERIDIAN DIAGNOSTICS, INC.
                           SAVINGS AND INVESTMENT PLAN

     B.   Name of issuer of the  securities  held  pursuant  to the Plan and the
          address of its principal executive office:

                           MERIDIAN DIAGNOSTICS, INC.
                              3471 RIVERHILLS DRIVE
                             CINCINNATI, OHIO 45244
                                  (513)271-3700

                           Index to Exhibits at Page 4







                              REQUIRED INFORMATION


     The Meridian Diagnostics, Inc. Savings and Investment Plan (the "Plan"), is
subject to the Employee Retirement Income Security Act of 1974.

         Item 4 In lieu of the  requirements  of Items 1, 2, and 3 of Form 11-K,
the following  financial  statements of the Plan,  notes thereto,  and Report of
Independent  Public  Accountants  thereon  are being filed as Exhibit 99 to this
report:

         Meridian  Diagnostics,  Inc.  Savings  and  Investment  Plan  Financial
         Statements  as of December 31, 1996 and December 31, 1995 together with
         Auditors' Report.







                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the Advisory  Committee  has duly caused this annual  report to be signed by the
undersigned thereunto duly authorized.


                                             MERIDIAN DIAGNOSTICS, INC.
                                             SAVINGS AND INVESTMENT PLAN




Dated: June 26, 1997                          By:   /s/Gerard Blain
                                                  ------------------------------
                                                     Gerard Blain
                                                     Vice President, Secretary
                                                     and Chief Financial Officer







                                INDEX TO EXHIBITS


The following Exhibits are being filed with this Annual Report on Form 11-K:

                                                                 Located at
                                                                Sequentially
     Exhibit                                                    Numbered Page
- -------------------------------------------------------------   -------------

       (23)    Consent of Independent Public Accountants              5

       (99)    ADDITIONAL EXHIBIT

               99   Annual Financial Statements of Meridian
                    Diagnostics, Inc. Savings and Investment
                    Plan for the years ended December 31, 
                    1996 and 1995...........................     F-1 - F-16