SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                   Form 10-Q/A


              (X) QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                  For the Quarterly Period Ended June 30, 1999

                                       OR

              ( )TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                        For the transition period from to
                         Commission file number 0-14902


                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES

- --------------------------------------      ------------------------------------
Incorporated under the laws of Ohio                          31-0888197
- --------------------------------------      ------------------------------------
                                            (I.R.S. Employer Identification No.)

                             3471 River Hills Drive
                             Cincinnati, Ohio 45244
                                 (513) 271-3700

Indicate  by a check  mark  whether  the  Registrant  (1) has filed all  reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days.

                                  Yes |X|           No __


Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest practicable date.


            Class                                  Outstanding August 16, 1999
- --------------------------------                   ---------------------------
      Common Stock, no par value                           14,384,076






                                       1



The Company's interim consolidated  financial statements as of June 30, 1999 and
for the  three-month  and  nine-month  periods then ended have been  restated to
reflect the  correction  of a  book-keeping  error  which  occurred in June 1999
related to sales to the Company's German subsidiary. This restatement amends the
following sections of this Form 10-Q:

     Part I, Item 1 -    Financial Statements;

     Part I, Item 2 -    Management's  Discussion  and  Analysis  of  Financial
                         Condition and Results of Operations; and

     Part II, Item 5 -   Exhibits and Reports on Form 8-K (Exhibit 27 -
                         Financial Data Schedule)




                                       2


                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES

                    INDEX TO QUARTERLY REPORT ON FORM 10-Q/A



                                                                         Page(s)
                                                                         -------
PART I   FINANCIAL INFORMATION

Item 1.  Financial Statements
           Consolidated Balance Sheets
           June 30, 1999 (Restated) and September 30, 1998                  3-4

           Consolidated Statements of Earnings
           Three Months Ended June 30, 1999 (Restated) and 1998
           Nine Months Ended June 30, 1999 (Restated) and 1998                5

           Consolidated Statement of Shareholders' Equity
           Nine Months Ended June 30, 1999 (Restated)                         6

           Consolidated Statements of Cash Flows
           Nine Months Ended June 30, 1999 (Restated) and 1998                7

           Notes to Consolidated Financial Statements                       8-13

Item 2.  Management's Discussion and Analysis of
         Financial Condition and Results of Operations                     14-17

PART II. OTHER INFORMATION

Item 4.  Other Information                                                   17
Item 5.  Exhibits and Reports on Form 8-K                                    18
           Signature                                                         19
           Exhibit 27 Financial Data Schedule (Restated)                  20-22
           Exhibit 99 Forward Looking Statements                             23








                                       3



                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
                 Consolidated Balance Sheets (Restated - Note 1)
                                   (Unaudited)


                                     ASSETS
                                     ($000)


                                                    June 30, 1999  September 30,
                                                     (Restated)        1998
                                                    -------------  -------------
CURRENT ASSETS:
  Cash and cash equivalents                         $     5,007     $   19,400
  Investments                                             2,226          4,369
  Accounts receivable and notes receivable,
     less allowance for doubtful accounts
     of $457 in 1999 and $171 in 1998                    11,925          9,707
  Inventories                                             9,385          5,569
  Prepaid expenses and other                              1,195            379
  Deferred tax assets                                       874            339
                                                    ------------    -----------

     Total current assets                                30,612         39,763
                                                    -----------     ----------

PROPERTY, PLANT AND EQUIPMENT:
  Land                                                      966            332
  Buildings and improvements                             10,092          7,095
  Machinery, equipment and furniture                     11,980          8,524
  Construction in progress                                  514            171
                                                    ------------    -----------
  Total property, plant and equipment                    23,552         16,122
  Less-accumulated depreciation
     and amortization                                     8,877          7,313
                                                    -----------     ----------

         Net property, plant and equipment               14,675          8,809
                                                    -----------     ----------

OTHER ASSETS:
  Long term receivables and other                           752          1,035
  Deferred tax assets                                         -            740
  Deferred debenture offering costs,
     net of accumulated amortization of
     $373  in 1999 and $271 in 1998                         956          1,057
  Other intangible assets, net of
     accumulated amortization of $7,651 in
     1999 and $6,730 in 1998                              5,968          6,537
  Cost in excess of net assets acquired,
     net of accumulated amoritization
     of $1,353 in 1999 and $539 in 1998                  17,454          1,206
                                                    ------------    -----------

     Total other assets                                  25,130         10,575
                                                    -----------     ----------

TOTAL ASSETS                                        $    70,417      $  59,147
                                                    ===========     ==========



                                       4



                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
                 Consolidated Balance Sheets (Restated - Note 1)
                                   (Unaudited)


                      LIABILITIES AND SHAREHOLDERS' EQUITY
                                     ($000)


                                                    June 30, 1999  September 30,
                                                     (Restated)        1998
                                                    -------------  -------------
CURRENT LIABILITIES:
  Current portion of long-term and
     capital lease obligations                      $     854         $     213
  Notes payable                                         3,424                 -
  Accounts  payable                                     2,273             1,050
  Accrued expenses                                      5,998             2,606
  Income taxes payable                                    454                 -
                                                    ----------       -----------

     Total current liabilities                         13,003             3,869
                                                    ----------       -----------

LONG-TERM AND CAPITAL LEASE OBLIGATIONS                21,610            20,595
                                                    ----------       -----------

DEFERRED INCOME TAXES                                     448                 -
                                                    ----------       -----------

SHAREHOLDERS' EQUITY:

  Preferred stock, no par value,
     1,000,000 shares authorized; none issued              -                  -
  Common stock, no par value,
     50,000,000 shares authorized;
     14,383,921 and 14,382,613 shares
     issued and outstanding,
     respectively, stated at                            2,398             2,397
  Additional paid-in capital                           20,657            20,653
  Retained earnings                                    12,684            11,935
  Accumulated other comprehensive
      income (loss)                                      (383)             (302)
                                                    ----------       -----------

     Total  shareholders' equity                       35,356            34,683
                                                    ----------       -----------

TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY          $  70,417         $  59,147
                                                    ==========       ===========



                                       5



                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
             Consolidated Statements of Earnings (Restated - Note 1)
                                   (Unaudited)
                        ($000, Except Per Share Amounts)



                                  Three Months Ended         Nine Months Ended
                                        June 30,                  June 30,
                                ---------------------   ------------------------
                                   1999        1998        1999        1998
                                (Restated)              (Restated)
                                ----------  ---------   ----------   ----------
NET SALES                       $  13,562   $  8,226    $  39,936    $  26,217

COST OF SALES                       4,801      2,366       14,467        8,407
                                ----------  ---------   ----------   ----------

  Gross profit                      8,761      5,860       25,469       17,810
                                ----------  ---------   ----------   ----------

OPERATING EXPENSES:
  Research and development            620        378        1,603        1,531
  Selling and marketing             2,810      2,062        8,471        5,713
  General and administrative        2,268        892        6,925        3,448
  Merger integration costs            630          -        1,842            -
                                ----------  ---------   ----------   ----------

  Total operating expenses          6,328      3,332       18,841       10,692
                                ----------  ---------   ----------   ----------

  Operating income                  2,433      2,528        6,628        7,118

OTHER INCOME (EXPENSE):
  Interest income                     114        240          383          888
  Interest expense                   (646)      (406)      (1,837)       (1,210)
  Other, net                          (64)        (4)        (206)            4
                                ----------  ---------   ----------   ----------
  Total other income (expense)       (596)      (170)      (1,660)         (318)

                                ----------  ---------   ----------   ----------
  Earnings before income taxes      1,837      2,358        4,968        6,800

INCOME TAXES                          741        929        2,062        2,696

                                ==========  =========   ==========   ==========
NET EARNINGS                    $   1,096   $  1,429    $   2,906    $   4,104
                                ==========  =========   ==========   ==========

BASIC  WEIGHTED AVERAGE
  NUMBER OF COMMON SHARES
  OUTSTANDING                       14,383      14,380      14,383       14,374
                                ==========  ==========  ==========   ==========

BASIC EARNINGS PER
  COMMON SHARE                   $    0.08   $    0.10    $   0.20   $     0.29
                                ==========  ==========   =========   ==========

DILUTED WEIGHTED AVERAGE
  NUMBER OF COMMON SHARES
  OUTSTANDING                       14,609      14,774      14,574       14,768
                                ==========  ==========   =========   ==========

DILUTED EARNINGS
  PER COMMON SHARE               $    0.08   $    0.10    $   0.20   $     0.28
                                ==========  ==========   =========   ===========


                                       6




                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
       Consolidated Statement of Shareholders' Equity (Restated - Note 1)
                     For the Nine Months Ended June 30, 1999
                                   (Unaudited)
                         ($000, Except Number of Shares)




                                 Number of                                            Accumulated
                                  Shares                                 Additional      Other
                                Issued and     Comprehensive   Common      Paid in   Comprehensive  Retained
                                Outstanding        Income       Stock      Capital   Income(Loss)    Earnings    Total
                                ------------   -------------  --------   ----------  -------------  ---------  --------
                                                                                        
Balance at September 30, 1998     14,382,613            -      $2,397      $20,653      $(302)       $11,935    $34,683
Stock Issuance                           400            -           -            2           -            -          2
Exercised Stock Options                  908            -           1            2           -            -          3
Dividends                                  -            -           -            -           -      (2,157)    (2,157)
Comprehensive Income
  Net earnings                             -        2,906           -            -           -        2,906      2,906
  Other comprehensive income
  (loss)
     Foreign currency
     translation adjustment                -          (81)          -            -        (81)            -       (81)
                                               -----------

Comprehensive Income                       -        2,825           -            -           -            -          -
                                  -----------  ===========     ------         ----     -------      -------    -------

Balance at June 30, 1999          14,383,921                   $2,398      $20,657      $(383)      $12,684    $35,356
                                  ==========                   ======      =======      ======      =======    =======






                                       7




                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
            Consolidated Statements of Cash Flows (Restated - Note 1)
                                   (Unaudited)
                                     ($000)

                                                            Nine Months Ended
                                                                 June 30,
                                                       -------------------------
                                                          1999          1998
                                                       (Restated)
                                                       ----------    -----------
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net earnings                                         $  2,906       $   4,104
  Non cash items:
    Depreciation of property,
      plant and equipment                                 1,563           1,018
    Amortization of intangible
      assets and deferred royalties                       1,836           1,162
    Deferred income taxes                                (1,037)           (199)
  Change in  current  assets
      and current liabilities net
      of effects of acquisition:
       Change in current assets
         excluding cash/cash
         equivalents and investments                     1,922           (1,021)
       Change in current liabilities,
         excluding current portion of
         long-term obligations                            (121)              87
  Long-term receivable and payable                         208              (48)
                                                      ---------         --------

     Net cash provided by operating activities           7,277            5,103
                                                      ---------        ---------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Acquisition of Gull Laboratories, Inc.,
    net of acquired cash                                18,440)               -
  Purchase of property, plant and
    equipment, net                                      (1,813)          (1,327)
  Sale (purchase) of short term investments              2,143             (795)
  Advance royalty                                            -              (25)
  Purchase of product  license                            (200)               -
                                                      ---------         --------
     Net cash used for investing activities             18,310)          (2,147)
                                                      ----------        --------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from long-term obligations                    3,354             180
  Repayment of long-term obligations                    (4,380)            (219)
  Dividends paid                                        (2,157)          (2,408)
  Proceeds from issuance of common stock                     5               19
                                                      ---------         --------
     Net cash used for financing activities             (3,178)          (2,428)
                                                      ---------         --------

EFFECT OF EXCHANGE RATE CHANGES ON CASH                   (182)            (106)

                                                      ---------         --------
NET INCREASE (DECREASE) IN
  CASH AND CASH EQUIVALENTS                            (14,393)             422

CASH & CASH EQUIVALENTS AT
  BEGINNING OF PERIOD                                   19,400           10,523
                                                      ---------         --------

CASH & CASH EQUIVALENTS AT
  END OF PERIOD                                     $    5,007         $ 10,945
                                                    ===========        =========

SUPPLEMENTAL DISCLOSURE OF
  CASH FLOW INFORMATION:
    Cash paid during the period for:
      Income taxes                                  $    1,600        $   3,054
      Interest                                           1,250              752


                                       8




                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements (Restated)
                                   (Unaudited)


1.   Basis of Presentation:

     The  consolidated  financial  statements  included  herein  have  not  been
     examined by independent  public  accountants,  but include all  adjustments
     (consisting  of normal  recurring  entries)  which are,  in the  opinion of
     management,  necessary  for a fair  presentation  of the  results  for such
     periods.

     Certain  information and footnote disclosure normally included in financial
     statements  prepared  in  accordance  with  generally  accepted  accounting
     principles have been omitted pursuant to the requirements of the Securities
     and Exchange Commission, although the Company believes that the disclosures
     included in these  consolidated  financial  statements are adequate to make
     the information not misleading.

     It is suggested  that these  consolidated  financial  statements be read in
     conjunction  with the consolidated  financial  statements and notes thereto
     included in the Company's latest annual report on Form 10-K.

     The  results of  operations  for the interim  periods  are not  necessarily
     indicative of the results to be expected for the year.

     The fiscal period 1999 consolidated  financial  statements  included herein
     have been restated to reflect the  correction of a bookkeeping  error which
     occurred in June 1999 related to sales to the Company's German  subsidiary.
     The impact of this  restatement  to earnings  for the three and  nine-month
     periods  ended June 30, 1999 is as follows (in  thousands  except per share
     amounts):



                            Three Months Ended June 30, 1999  Nine Months Ended June 30, 1999
                            --------------------------------  --------------------------------
                                As                     As       As                       As
                             Reported  Correction   Restated  Reported   Correction   Restated
                             --------  ----------   --------  ---------- ----------   --------
                                                                    
Net sales                    $13,825     $(263)     $13,562    $40,199      $(263)    $39,936
Cost of sales                  4,660       141        4,801     14,326        141      14,467
                             --------    ------     --------   -------      ------    --------
   Gross profit                9,165      (404)       8,761     25,873       (404)     25,469

Earnings before income
  taxes                        2,241      (404)       1,837      5,372       (404)      4,968

Provision for income
  taxes                          896      (155)         741      2,217       (155)      2,062

Net income                     1,345      (249)       1,096      3,155       (249)      2,906

Basic earnings per
  share                         0.09     (0.01)        0.08       0.22      (0.02)       0.20

Dilutive earnings
  per share                     0.09     (0.01)        0.08       0.22      (0.02)       0.20






                                       9





2.   Acquisition of Gull Laboratories, Inc.:

     On November 5, 1998,  the Company  acquired all of the common stock of Gull
     Laboratories,  Inc. (Gull) for  approximately  $18.0 million,  in cash. The
     purchase price was financed by cash and cash  equivalents on hand.  Gull is
     engaged in the  development,  manufacture  and  marketing  of  high-quality
     diagnostic  test  kits  for  the  detection  of  infectious   diseases  and
     autoimmune  disorders.  Gull  also  offers  a line of  instrumentation  for
     laboratory automation and products for blood grouping and HLA tissue typing
     for  transplantation.  Fresenius  AG, a German stock company and the former
     majority   shareholder  of  Gull  ("Fresenius"),   is  subject  to  certain
     non-competition  agreements,  as are certain  employees  of Gull upon their
     leaving the employment of the Company.  One June 16, 1999, the Company paid
     $1,716,000  of the amounts Gull owed to  Fresenius,  including  interest at
     7.5%,  as agreed to in the  purchase  agreement.  The final  settlement  of
     amounts Gull owed to Fresenius at October 31, 1998,  are subject to various
     adjustments as agreed to in the purchase  agreement and are scheduled to be
     paid on December 31, 1999,  with annual  interest at 7.5%.  For  accounting
     purposes, the acquisition was effective on October 31, 1998 and the results
     of  operations  of  Gull  are  included  in  the  consolidated  results  of
     operations  of the Company from that date forward.  The resulting  goodwill
     from this transaction is being amortized over twenty years.

     The following  unaudited pro forma  combined  results of operations for the
     year ended  September 30, 1998,  the quarter  ended June 30, 1999,  and the
     nine  months  ended  June  30,  1998 and June  30,  1999,  assume  the Gull
     acquisition  occurred as of October 31, 1997 (dollars in thousands,  except
     per share data).  Pro forma  adjustments  consist of reductions in interest
     income  due to the use of cash and  investments  to fund  the  acquisition,
     additional  amortization  based on a  preliminary  estimate of goodwill and
     adjustments to the tax provision assuming an effective tax rate of 38%, the
     utilization  of a portion  of Gull U.S.  losses  and the  establishment  of
     valuation reserves for potentially unrealizable deferred tax assets related
     to pro forma operating losses.

     The unaudited pro forma financial  information presented is not necessarily
     indicative of either the results of operations that would have occurred had
     the acquisition taken place on October 1, 1997 or the results of operations
     of the combined companies.




                                                                               9 Months Ended
                                                                                  June 30,
                                                                        ------------------------
                                  Year Ended           3 Months Ended     1999
                                 September 30, 1998     June 30, 1998   (Restated)       1998
                                 ------------------    --------------   -----------   ----------

                                                                           
     Net sales................      $ 53,535             $ 13,135        $ 41,426      $ 41,673
     Net earnings (loss)......      $     92              $  (203)       $  2,979      $    287
     Earnings (loss) per share:
          Basic...............      $   0.01              $  (.01)       $    .21      $    .02
          Diluted.............      $   0.01              $  (.01)       $    .20      $    .02




    In  connection  with the  acquisition  of Gull,  assets  were  acquired  and
    liabilities  were assumed as follows,  based upon  preliminary  estimates of
    fair values (dollars in thousands):



                                       10




    FAIR VALUE OF ASSETS ACQUIRED INCLUDING:

    Cash and cash equivalents ...................................   $   640
    Accounts and notes receivable ...............................     3,210
    Inventories .................................................     5,065
    Other current assets ........................................       640
    Property, plant and equipment ...............................     5,620
    Other non-current assets ....................................       675
    Goodwill ....................................................    16,605
                                                                    -------
                                                                     32,455
    Less:  Cash paid for net assets .............................    18,000
                                                                    -------
                                                                    $14,455
                                                                    =======

LIABILITIES ASSUMED INCLUDING:
    Liabilities assumed .........................................   $ 4,915
    Additional purchase liabilities .............................     1,835
    Debt ........................................................     5,680
    Deferred tax liabilities ....................................       500
    Acquisition costs ...........................................     1,525
                                                                    -------
                                                                    $14,455
                                                                    =======

     The estimates  presented above are subject to change pending the completion
     of  certain  appraisals  and  other  analyses  of the fair  value of assets
     acquired and  liabilities  assumed,  and  finalization  of October 31, 1998
     audit  adjustments.  The  allocation  of  purchase  price  may  include  an
     allocation  to in-process  research and  development.  In fiscal 2000,  the
     Company plans to close the Salt Lake City and certain  other  facilities of
     Gull,  sell the  Gull  land  and  buildings  in Salt  Lake  City,  transfer
     equipment,  technology  and  manufacturing  capabilities  to the  Company's
     headquarters in Cincinnati and terminate  substantially  all Gull employees
     located in Salt Lake City. Additional purchase liabilities recorded to date
     include  approximately  $1.8 million for severance and stay bonus  reserves
     and  costs  related  to the shut  down and  consolidation  of the  acquired
     facilities  in Salt  Lake  City and  Germany,  plus  certain  deferred  tax
     liabilities.

     To date,  Gull research and development  activities have been  consolidated
     into  Meridian's,  production  facilities  in Germany  have been shut down,
     renovation  of the  Cincinnati  facilities is underway to  accommodate  the
     manufacture  of Gull  products and certain Gull  products are already being
     produced in  Cincinnati.  Approximately  one-third of the Gull positions at
     the time of the acquisition have been eliminated to date.

     The major  components of the merger  integration  costs incurred during the
     nine-month period are as follow:

                                                                     Amount
                                                                    --------
     Materials for product testing                                  $    240
     Travel and training                                                 425
     Consulting primarily related to
          reorganization of
          European operation                                             275
     Termination payments to distributors                                430
     Other                                                               472
                                                                    --------
                                                                    $  1,842
                                                                    ========


                                       11




     Additional  costs are  expected to be  incurred  related to  materials  for
     product testing,  travel,  moving and facility closing costs. The amount of
     total merger integration costs is not expected to exceed $2,500.


3.   Inventories:

     Inventories are comprised of the following (amounts in thousands):

                                      June 30, 1999          September 30, 1998
                                      -------------          ------------------
     Raw materials                        $3,096                    $1,480
     Work-in-process                       2,241                     1,715
     Finished goods                        4,048                     2,374
                                      ===========               ===========
                                          $9,385                    $5,569
                                      ===========               ===========


4.   Income Taxes:

     The provisions  for income taxes were computed at the estimated  annualized
     effective  tax rates  utilizing  current  tax law in effect,  after  giving
     effect to research and experimentation  credits and recognizing the benefit
     of Gull post-acquisition losses incurred in Europe.

5.   Earnings Per Common Share:

     Basic earnings per share (EPS) is computed by dividing income  available to
     common  shareholders  by the  weighted  average  number  of  common  shares
     outstanding.  Diluted  EPS is computed  by adding to the  weighted  average
     number of common  shares  outstanding,  the dilutive  effect of  additional
     common shares that would have been outstanding if dilutive potential common
     shares had been issued.

     The table below shows the amounts used in computing  earnings per share and
     the  effect on income  and the  weighted  average  number of shares for the
     three-month and nine-month periods ended June 30, 1999 and June 30, 1998 of
     dilutive potential common stock.


                                       12









                                                                       QUARTER ENDED

                                         June 30, 1999 (Restated)                               June 30, 1998
                               -------------------------------------------       --------------------------------------------
                                 Income           Shares         Per Share         Income            Shares         Per Share
                               (Numerator)     (Denominator)       Amount        (Numerator)     (Denominator)       Amount
                               -----------     -------------     ---------       -----------     -------------      ---------
                                                                                                     
     In thousands,
     except per share
     amounts

     BASIC
     EARNINGS PER
     SHARE


     Net income available
     to common shareholders       $1,096          14,383            $0.08           $1,429           14,380            $0.10
     ------------------------------------------------------------------------------------------------------------------------

     EFFECT OF DILUTIVE
     SECURITIES

     Stock Options                     -             226                                 -             394
     ------------------------------------------------------------------------------------------------------------------------

     DILUTED EARNINGS PER
     SHARE

     Net income available
     to common
     shareholders and
     assumed conversions           $1,096         14,609            $0.08           $1,429           14,774            $0.10
     ========================================================================================================================





                                       13







                                                                     NINE MONTHS ENDED

                                         June 30, 1999 (Restated)                               June 30, 1998
                               -------------------------------------------       --------------------------------------------
                                 Income           Shares         Per Share         Income            Shares         Per Share
                               (Numerator)     (Denominator)       Amount        (Numerator)     (Denominator)       Amount
                               -----------     -------------     ---------       -----------     -------------      ---------
                                                                                                   
     In thousands,
     except per share
     amounts

     BASIC
     EARNINGS PER
     SHARE

     Net income available
     to common shareholders    $2,906            14,383           $0.20           $4,104             14,374           $0.29
     ----------------------------------------------------------------------------------------------------------------------
     EFFECT OF DILUTIVE
     SECURITIES

     Stock Options                 -                191               -                -               394
     ----------------------------------------------------------------------------------------------------------------------

     DILUTED EARNINGS PER
     SHARE

     Net income available
     to common
     shareholders and
     assumed conversions       $2,906            14,574            $0.20          $4,104             14,768          $0.28
     ======================================================================================================================



     The following  table  outlines items excluded from diluted EPS, as they are
     anti-dilutive.

                                       Quarter Ended         Nine-Months Ended
                                         June 30,                June 30,
                                  ---------------------   ----------------------
                                     1999        1998        1999        1998
                                  ---------    --------   ---------    ---------

     Options                           442         230         481         230
     Convertible debentures          1,243       1,243       1,243       1,243
                                  =========    ========    ========    ========
                                     1,685       1,473       1,724       1,473
                                  =========    ========    ========    ========

At both June 30,  1999 and 1998,  the impact of  assuming  the 1996  convertible
debentures  were converted,  net of the impact of pro forma,  after tax interest
expense, was anti-dilutive.



                                       14



6.   Translation of Foreign Currency:

     Assets and liabilities of foreign  operations are translated  using quarter
     end exchange  rates.  Revenues and expenses are  translated  using exchange
     rates  prevailing  during the period  with gains or losses  resulting  from
     translation  included in a separate component of other comprehensive income
     (loss).  Gains and losses resulting from transactions in foreign currencies
     were immaterial.

7.   Comprehensive Income:

     During  1997,  the  Financial  Accounting  Standards  Board  (FASB)  issued
     Statement No. 130 (Statement 130) on "Reporting  Comprehensive Income". The
     Company adopted this standard  effective  October 1,1998.  The objective of
     Statement  130 is to report a measure  of all  changes  in the equity of an
     enterprise that result from  transactions  and other economic events of the
     period  other  than  transactions  with  owners  ("comprehensive  income").
     Comprehensive income (loss) is the total of net income (loss) and all other
     non-owner changes in equity. For the Company, this reporting involves gains
     and losses  resulting  from the  translation  of assets and  liabilities of
     foreign operations.

8.   Segment Information:

     During  1997,  the  FASB  issued  Statement  No.  131  (Statement  131)  on
     "Disclosure About Segments of an Enterprise and Related  Information".  The
     Company will adopt  Statement 131 this fiscal year;  however,  there are no
     interim reporting requirements in the initial year of adoption. The Company
     is still evaluating the impact of the new disclosure  requirements in light
     of the Gull  acquisition.  New  disclosure  requirements,  if any, will not
     impact the Company's financial position or results of operation.

9.   Reclassifications:

     Certain  reclassifications  have  been made to the  accompanying  financial
     statements to conform to the June 30, 1999 presentation.

10.  Recently Issued Accounting Standards:

     In June 1998, the Financial  Accounting Standards Board issued Statement of
     Financial   Accounting   Standards  No.  133,   Accounting  for  Derivative
     Instruments and Hedging Activities.  The Statement  establishes  accounting
     and  reporting  standards   requiring  that  every  derivative   instrument
     (including certain derivative  instruments  embedded in other contracts) be
     recorded in the balance  sheet as either an asset or liability  measured at
     its fair value.  The Company does not currently hold nor invest in any type
     of derivative instruments.

     In March  1998,  the AICPA  issued  SOP98-1-  "Accounting  for the Costs of
     Computer  Software  Developed or Obtained for Internal Use" which  requires
     capitalization  of external direct costs of materials and services consumed
     in  developing or obtaining  internal-use  computer  software;  payroll and
     payroll-related  costs for employees who are directly  associated  with and
     who devote  time to the  internal-use  computer  software  project  (to the
     extent of the time spent  directly  on the  project);  and  interest  costs
     incurred  when  developing  computer  software for internal  use.  Training


                                       15




     costs,  data conversion  costs,  costs incurred in the preliminary  project
     stage and  maintenance  fees should be expensed as incurred.  Additionally,
     significant updates and enhancements are capitalized if it is probable that
     the result will be significant  additional  functionality or an increase in
     the life of the software. The capitalization of computer software developed
     or obtained for internal use should be amortized on a  straight-line  basis
     unless another systematic and rational manner is more representative of the
     use of the software.  This SOP is effective for  financial  statements  for
     fiscal years beginning  after December 15, 1998 (the Company's  fiscal year
     2000),  and should be  applied  to  internal-use  computer  software  costs
     incurred in those  fiscal  years for all  projects,  including  projects in
     progress upon initial  application  of the SOP. The Company does not expect
     adoption of this  accounting  pronouncement  will have a material impact on
     the Company's financial position or operating results.

Item 2. Management's  Discussion and Analysis of Financial Condition and Results
        of Operations

Background

On November 5, 1998, the Company acquired all of the approximately eight million
shares of common stock of Gull Laboratories, Inc. (Gull) for approximately $18.0
million,  in cash. The purchase price was financed by cash and cash  equivalents
on hand.  Gull is engaged  in the  development,  manufacture  and  marketing  of
high-quality  diagnostic test kits for the detection of infectious  diseases and
autoimmune disorders.  Gull also offers a line of instrumentation for laboratory
automation   and  products  for  blood   grouping  and  HLA  tissue  typing  for
transplantation.  For accounting purposes, the acquisition was effective October
31, 1998.  The results of  operations  of Gull are included in the  consolidated
results of  operations  of the Company  from that date  forward.  The  resulting
goodwill from this  transaction is being amortized over twenty years. See Note 2
of the Notes to Consolidated Financial Statements for further information.

Results of Operations

The fiscal  period  1999  interim  consolidated  financial  statements  included
herein,  and the  comparative  discussion  that  follows,  have been restated to
reflect  the  correction  of a  bookkeeping  error  which  occurred in June 1999
related  to  sales  to the  Company's  German  subsidiary.  The  impact  of this
restatement  to earnings for the fiscal periods ended June 30, 1999 is discussed
in Note 1 to the interim consolidated financial statements included herein.

Consolidated  net sales  increased  $5,336,000,  or 65%, to $13,562,000  for the
third fiscal quarter and increased $13,719,000, or 52%, to $39,936,000,  for the
nine  months  ended  June 30,  1999,  principally  from the  impact  of the Gull
acquisition  and the continued  strong  performance of the Gull products.  These
increases  of  $5,336,000  and  $13,719,000  respectively,  for the  quarter are
comprised of volume growth of $4,916,000,  or 60%,  pricing of $480,000,  or 6%,
and unfavorable currency of $60,000, or (1%); for the nine months, volume growth
of $12,391,000 or 47%, pricing of $1,229,000, or 5%, and currency of $99,000.

Core business product sales increased about 11% for the quarter versus the prior
year, a major turnaround from the first six months which were down 2% versus the
previous year as a result of distributor  order patterns in the U.S. and Europe.
New product sales led by Premier Platinum  HpSA(TM) (H. pylori) and the IC Stat!
line  of  products,   contributed   approximately  $500,000  and  $1,460,000  of
incremental  revenues for the quarter and nine-month  periods  respectively.  C.
difficile sales were up $169,000,  or 9% for the quarter,  but remained about 7%
below the prior year nine  months  results.  All other key  product  groups were
performing ahead of the prior year through June 30.



                                       16



Gross profit  increased  $2,901,000,  or 50%, to $8,761,000  for the quarter and
$7,659,000,  or 43%, to  $25,469,000 or the  nine-month  period  compared to the
sales increase of 65% for the quarter and 52% for the nine-month  period.  Gross
profit decreased as a percentage of sales to 65% from 71% for the quarter and to
64% from 68% for the  nine-month  period.  For the  quarter,  the  gross  profit
reflects improved pricing as noted above,  offset primarily by the impact of the
lower margins for Gull product sales compared to the historical Meridian margins
resulting  in an overall  decrease of five  points as a percent of sales.  These
same  factors  contributed  to the  decline in gross  profit for the  nine-month
period  compared to the prior year.  The Company  expects  that this drag on the
overall gross profit will continue until the Company  completes the  integration
of Gull's  production  into its Cincinnati  facilities and the sellout of Gull's
Salt Lake City  production,  which is  expected  to occur in about nine  months.
Gross  profit in the third  quarter  increased  six  percentage  points over the
second quarter  primarily due to sales in the third quarter shifting to a higher
percentage of historical Meridian products.

Total operating  expenses  increased  $2,996,000,  or 90%, to $6,328,000 for the
third fiscal  quarter  versus the prior year, and increased to 47% of sales from
41% versus the same period  last year,  primarily  due to the Gull  acquisition.
Similarly,  operating  expenses for the nine-month  period compared to the prior
year were up  approximately  76%, and  increased to 47% from 41% as a percent of
sales.  Research  and  development  costs  increased  $242,000  to 5% of  sales,
comparable with the prior year quarter and increased $72,000, declining to 4% of
sales from 6% for the nine month period. This increase for the nine months ended
June 30, 1999 reflects a combination of Gull research and  development  expenses
and increases in Meridian research personnel costs,  largely offset by the prior
year clinical  study costs  associated  with Premier  Platinum  HpSA,  which was
cleared  for  marketing  in May 1998.  As of March 1,  1999,  all  research  and
development activity was consolidated at Meridian's  headquarters in Cincinnati.
Selling and marketing expenses increased $748,000,  or 36%, for the third fiscal
quarter and $2,758,000 or 48%, for the nine-month period.  Selling and marketing
costs declined  approximately four points from 25% of sales to 21% for the third
fiscal quarter and remained  relatively  flat at 21% of sales for the nine-month
period.  General and  administrative  costs increased  $1,376,000,  or 154%, and
increased as a percent of sales to 17% from 11% for the third quarter; increased
$3,477,000  or 101% for the  nine-month  period to 17% of sales  versus  13% the
prior  year.  This  increase  is  also  attributable  to the  Gull  acquisition,
including $254,000 of amortization of Gull-related  goodwill for the quarter and
$667,000 for the nine-month period. In connection with the Gull acquisition, the
Company incurred merger  integration costs of approximately  $630,000 during the
third fiscal  quarter and  $1,842,000  for the  nine-month  period.  These costs
consist of payments made to distributors to terminate  contracts in markets with
duplicate  distributor  agreements or in markets that will now be covered by the
Company  sales forces,  training,  travel,  product  validation  and  consulting
charges in connection  with the  integration  of the Gull  business.  Additional
merger  integration  costs are  expected to be incurred in  connection  with the
ongoing integration efforts.  Total merger integration costs are not expected to
exceed $2.5 million.

Operating income decreased $95,000, or 4%, and declined as a percent of sales to
18% from 31% for the quarter, and decreased $490,000,  declining as a percent of
sales  to  17%  from  27%  for  the  nine-month  period.  Excluding  the  merger
integration  costs of $630,000 for the quarter and $1,842,000 for the nine-month
period,  operating income  increased  $535,000,  or 21% and $1,352,000,  or 19%,
respectively.  Other expense increased $426,000 for the third fiscal quarter and
$1,342,000 for the nine-month  period.  These increases are primarily related to
$366,000  in net  interest  expense  for  the  quarter  and  $1,132,000  for the
nine-month  period for  Gull-related  obligations  coupled  with the effect of a
reduction in interest  income due to the use of cash and  investments to acquire
Gull. The Company's  effective tax rate was relatively flat at 40% for the third
quarter and up approximately two points to 42% for the nine-month period.  Based
on tax planning strategies, the Company elected to record a benefit for the full
amount of  post-acquisition  operating losses incurred to date in Gull's foreign
operations.  The  increase  in  the  tax  rate  over  last  year  is  due to the
amortization of Gull  acquisition-related  goodwill, which is not deductible for
book or tax purposes.


                                       17



Liquidity and Capital Resources

The  Company's  cash flow  requirements  mainly  consist of working  capital for
operations, capital expenditures, dividends on common stock and debt repayment.

Net cash flows provided by operations  increased  $2,174,000 for the nine months
ended June 30, 1999,  primarily due to cash funded by working capital items. The
total of net earnings and depreciation/amortization were relatively flat despite
approximately $1,800,000 of pretax merger integration costs incurred to date.

Net cash used for investing activities increased  $16,163,000 which is more than
accounted for by cash paid during the nine-month period for the acquisition Gull
of $18,440,000  which includes  transaction  costs of $1,080,000 paid during the
nine-month period and is net of cash acquired of $640,000.

Net cash flows used for  financing  activities  increased  $750,000 for the nine
months,  largely due to payments  made on debt  obligations  assumed in the Gull
acquisition net of proceeds from new obligations.

Net  cash  flows  from  operations  are  anticipated  to  fund  working  capital
requirements  for the  balance of the fiscal  year.  The  Company  has an unused
$11,646,000  line of credit with a commercial bank and cash/cash  equivalent and
short-term investments of $7,233,000 at June 30, 1999. For the year, the Company
expects  to  incur  capital  expenditures  of  approximately  $4,200,000,  which
includes   $3,000,000  for  the  renovation  of  the  Cincinnati   manufacturing
facilities related to the integration of Gull product manufacturing and $500,000
related to new computer systems in Europe.

Year 2000 Readiness Disclosure

The Year 2000 issue results from date sensitive  computer programs that only use
the last two digits to refer to a year. Such computer  programs may not properly
recognize years subsequent to 1999. This issue impacts the Company and virtually
every business that relies on a computer.  If not corrected,  system failures or
miscalculations  could occur causing  disruption  of the  Company's  operations,
including among other things, a temporary  inability to process  transactions or
to engage in similar normal business activities.

A project  team has been formed to address the  Company's  Year 2000  readiness.
Information  technology  (IT) systems,  such as any hardware or software used to
process  daily  operational  data and  information,  as well as  non-information
technology systems, such as computer chips embedded in manufacturing, laboratory
and telecommunications  equipment,  are being assessed for Year 2000 compliance.
This assessment is substantially complete.

In November 1997, the Company completed a major upgrade of its computer hardware
and primary  business system  applications in the U.S. as part of planned system
enhancements to support the business.  The cost of the upgrades,  which are Year
2000  compliant,  was  approximately  $400,000.  The Company  has  substantially
completed its assessment of the compliance of other IT and non-IT systems in the
U.S. Remediation efforts which include  modifications or replacement of software
and certain hardware.  The Company anticipates completion of all remediation and
testing of its systems by December  31, 1999.  The  Company's  current  business
systems in Belgium and Germany  are being  replaced  and the system in Italy has
been upgraded to a Year 2000 compliant  version.  These  locations are primarily
involved in sales and  distribution  functions and do not  manufacture  product.
Non-IT  systems in European  locations  are being  assessed in  connection  with
planned office and warehouse relocations expected to occur prior to December 31,
1999. The Company  expects that many of the existing Gull operations and related
systems in the U.S. will be integrated  into the Meridian  operation  during the



                                       18



last  quarter  of fiscal  year 1999 and the first  quarter of fiscal  2000.  The
Company has also  addressed the status of  instrumentation  equipment  leased to
customers  and is in the process of replacing or upgrading  the equipment to the
extent it is not compliant.

The Company is evaluating the status of  significant  customers and suppliers to
determine the extent to which it is vulnerable to these third  parties.  Ongoing
evaluation will continue through 1999;  however,  the Company believes its broad
customer base and  availability  of alternate  suppliers will mitigate the risks
associated with these third parties.

The Company is developing a contingency  plan.  The  contingency  plan addresses
critical business  processes in the event Year 2000 efforts are not completed in
a timely  manner.  The  contingency  plans for IT systems  include  using manual
systems,  and  resetting  internal  clocks to an  earlier  date for many  non-IT
systems.  The  contingency  plan  will be  further  expanded,  as  required,  as
remediation  and testing  procedures  are completed  throughout the remainder of
1999.

Costs specifically  associated with the Company's Year 2000 efforts to date have
consisted  mainly of  internal  costs and capital  expenditures  such as systems
software and hardware  replacements or upgrades and non-IT systems  replacements
or upgrades and are estimated to be $750,000 when complete.

Although the Company has not yet completed its Year 2000 efforts,  after certain
upgrades  and  replacements  are made,  it believes the Year 2000 issue will not
pose significant  operational  problems.  However, if such modifications are not
made or are not  completed  in  time,  or if a  material  third  party  fails to
properly  remediate  its Year  2000  issues,  or if the costs  are  higher  than
expected,  the Year 2000 issue  could have a  material  effect on the  Company's
operations.  While  the  Company  is not  currently  aware  of  any  significant
exposure,  there can be no  assurance  that the Year 2000  issue will not have a
material impact on the business and operations of the Company.

The Company is also in the process of assessing the impact of the  conversion to
the Euro on its systems and business operations. The conversions and upgrades of
the European  systems  noted above will also enable these  operations to process
Euro  transactions.  Currently,  the  Company has  significant  sales in Europe,
certain of which are denominated in U.S. dollars. When fully adopted, the use of
a single currency in participating  countries may affect pricing of transactions
due to the  transparency  of prices.  Factors such as local  taxes,  freight and
handling  costs,  and  customer  preferences  may  eliminate  the need for price
adjustments.  With the acquisition of Gull and the related  increase in European
sales, the Company is currently evaluating the impact of this conversion.

PART II.  OTHER INFORMATION

Item 4    Other Information

         On June 24, 1999,  William J. Motto, a founder of the Company and Chief
         Executive Officer, received The Cincinnati/Northern Kentucky 1999 Ernst
         & Young Entrepreneur of the Year Award in the Technology division. This
         Award is sponsored nationally by Ernst & Young, USA Today, the Kauffman
         Center for  Entrepreneurial  Leadership  at the Ewing  Marion  Kauffman
         Foundation, the Nasdaq-Amex Market Group, CNN and CNNfn.


                                       19



         On July 3, 1999, The Lancet published an article  entitled,  "Diagnosis
         of Helicobacter pylori infection with a new non-invasive  antigen-based
         assay,"  (Dr. D. Vaira,  et.  al.).  This  article  reported on a study
         designed to confirm the accuracy of Meridian's  Premier Platinum HpSATM
         (HpSA),  our new test for the detection of the H. pylori  antigen which
         causes stomach ulcers. Approximately 500 patients were tested using the
         HpSA test, the C13-Urea Breath Test and four  endoscopies for H. pylori
         detection.  The HpSA test displayed  excellent  results with an overall
         accuracy in excess of 90%. H.  pylori  infections  affect up to 50% and
         80% of the population in developed countries and in developing regions,
         respectively.  The cost to manage  peptic ulcer  disease has reached $6
         billion each year.

         On June 25, 1999, the United States Food and Drug Administration  (FDA)
         gave  clearance to market two  diagnostic  tests for the herpes simplex
         virus. These tests, Premier(TM)  Type-Specific HSV-1 IgG ELISA Test and
         Premier Type-Specific HSV-2 IgG ELISA Test, are the first medical tests
         cleared by the FDA that have been proven to distinguish  Herpes Simplex
         Virus (HSV) Type 1 (oral) from Type 2 (genital)  herpes  infections via
         serological  blood test  methods.  With the FDA  clearance of these two
         blood tests,  discrimination between HSV-1 and HSV-2 infections now can
         be made  routinely  in any  clinical  laboratory.  Between  200,000  to
         500,000  people  contract the HSV  infection,  the third most prevalent
         sexually  transmitted  disease in the United  States,  annually with as
         many as 30 million Americans infected with HSV-2.

         On July 14, 1999,  the Company  announced that Premier EHEC was used to
         diagnose  young adults  impacted by an outbreak of toxigenic E. coli in
         Texas  caused by the bacteria  Escherichia  coli (E. coli) strain O111.
         Meridian's  Premier EHEC assay  indicated the presence of Shiga toxins,
         the toxins produced by all strains of enterohemorrhagic E. coli (EHEC).

         On August 11,  1999,  the Company  received  clearance  from the United
         States Food and Drug  Administration to market ImmunoCard  STAT!(TM) E.
         coli 0157 Plus. The rapid test will detect the most prevalent toxigenic
         strain of E. coli,  E. coli  0157:H7,  which is often  transmitted  via
         ground beef  vegetables and other foods.  ImmunoCard  STAT!(TM) E. coli
         0157 Plus,  which can be performed in  approximately  10 minutes,  will
         enable  laboratories  to  report  accurate  results  much  sooner  than
         conventional culture methods that can take 24-72 hours to process.

Item 5    Exhibits and Reports on Form 8-K

(a)      Exhibits:

           Exhibit No.      Description                             Page(s)
           -----------      ---------------------------------       -------
           27               Financial Data Schedule (Restated)       20-22
           99               Forward Looking Statements                  23

(b)      Reports on Form 8-K:

           None


                                       20




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 there-unto duly authorized.

                                     MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES


Date: August 4, 2000                 /s/  Melissa Lueke
                                     -------------------------------------------
                                          Melissa Lueke
                                          Corporate Controller
                                         (Acting Principal Accounting Officer)