SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    Form 10-Q


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

                For the Quarterly Period Ended December 31, 1997

                                       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.
- --------------------------------------------------------------------------------
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 at January 29, 1998
- -------------------------------           --------------------------------
  Common stock, no par value                         14,371,932


                                  Page 1 of 13







                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES


                     INDEX TO QUARTERLY REPORT ON FORM 10-Q

                                                                     Page(s)
                                                                     -------

PART I.  FINANCIAL INFORMATION

Item 1.  Financial Statements-

        Consolidated Balance Sheets -
        December 31, 1997 and September 30, 1997                        3-4


        Consolidated Statements of Earnings -
        Three Months Ended December 31, 1997 and 1996                    5


        Consolidated Statements of Cash Flows - 
        Three Months Ended December 31, 1997 and 1996                    6


        Notes to Consolidated Financial Statements                      7-8


Item 2.  Management's Discussion and Analysis of
         Financial Condition and Results of Operations                  9-10



PART II. OTHER INFORMATION

        Item 5. Other Information                                        11
        Item 6. Exhibits and Reports on Form 8-K                         12

        Signature

        Exhibit 11 Computation of Earnings per Common Share              13
        Exhibit 27 Financial Data Schedule                             14-16


                                  Page 2 of 13







                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
                           Consolidated Balance Sheets
                                   (Unaudited)

                                     ASSETS

                                                     December 31,  September 30,
                                                         1997          1997
                                                      -----------  -------------
CURRENT ASSETS:
    Cash and cash equivalents                         $11,053,773   $10,523,191
    Investments                                        11,653,994    11,213,144
    Accounts receivable, less allowance 
       of $197,628 and $166,742 for 
       doubtful accounts                               10,872,791    10,622,759
    Inventories                                         4,519,091     4,651,687
    Prepaid expenses and other                            251,912       458,732
    Deferred tax assets                                   496,276       382,518
                                                       ----------    ----------
       Total current assets                            38,847,837    37,852,031
                                                       ==========    ==========

PROPERTY, PLANT AND EQUIPMENT:
    Land                                                  256,816       259,993
    Building improvements                               6,616,820     6,629,847
    Machinery, equipment and furniture                  8,170,499     7,822,671
    Construction in progress                              128,832        96,218
                                                       ----------    ----------
                                                       15,172,967    14,808,729
    Less- Accumulated depreciation
       and amortization                                 6,524,683     6,359,499
                                                      -----------   -----------
       Net property, plant and equipment                8,648,284     8,449,230
                                                      -----------   -----------

  OTHER ASSETS:
    Long-term receivable and other                        296,300       298,301
    Deferred royalties                                    176,383       195,355
    Deferred tax assets                                   672,842       645,542
    Deferred debenture offering costs, 
       net of accumulated amortization of 
       $170,250 and $136,500                            1,158,086     1,191,836
    Covenants not to compete, net of
       accumulated amortization
       of $3,308,855 and $3,123,408                     2,211,740     2,397,186
    License agreements, net of 
       accumulated amortization
      of $901,930 and $887,541                            233,182       247,571
    Patents, tradenames, customer lists 
       and distributorships, net of
       accumulated amortization of 
       $1,277,512 and $1,204,686                        2,882,358     2,954,764
    Other intangible assets, net of 
       accumulated amortization of 
       $341,219 and $303,869                            1,899,781     1,937,131
    Costs in excess of net assets acquired, 
       net of accumulated amortization 
       of $449,992 and $422,880                         1,294,831     1,321,943
                                                      -----------  ------------
       Total other assets                              10,825,503    11,189,629
                                                      -----------  ------------

       Total assets                                   $58,321,624   $57,490,890
                                                      ===========   ===========


                                  Page 3 of 13







                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES

                           Consolidated Balance Sheets
                                   (Unaudited)


                      LIABILITIES AND SHAREHOLDERS' EQUITY


                                                    December 31,   September 30,
                                                         1997           1997
                                                    ------------   -------------
CURRENT LIABILITIES:

    Current portion of long-term 
      obligations                                $           9      $    73,877
    Current portion of capital 
      lease obligations                                205,701          106,516
    Accounts payable                                 1,107,753          839,093
    Accrued payroll and payroll taxes                  728,584          841,603
    Other accrued expenses                           1,653,595        1,244,078
    Income taxes payable                             1,312,724        1,165,636
                                                    ----------       -----------
       Total current liabilities                     5,008,366        4,270,803
                                                    ----------       -----------
LONG-TERM OBLIGATIONS                               20,026,322       20,023,880
                                                    ----------       -----------
CAPITAL LEASE OBLIGATIONS                              730,040          557,313
                                                    ----------       -----------


SHAREHOLDERS' EQUITY:

    Preferred stock, no par value, 
     1,000,000 shares
     authorized; none issued                               -                -

    Common stock, no par value, 
     50,000,000 shares authorized; 
     14,371,932 and 14,365,289 shares
     issued and outstanding, 
     respectively stated at                          2,394,321        2,393,852
    Additional paid-in capital                      20,576,852       20,571,453
    Retained earnings                               10,105,330       10,103,837
    Cumulative foreign currency 
      translation adjustment                          (519,607)        (430,248)
                                                    ----------       -----------

       Total shareholders' equity                   32,556,896       32,638,894
                                                    ----------       -----------

       Total liabilities and 
         shareholders' equity                      $58,321,624      $57,490,890
                                                   ===========      ===========


                                  Page 4 of 13







                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
                       Consolidated Statements of Earnings
                                   (Unaudited)

                                                          Three Months Ended
                                                             December 31,
                                                      --------------------------
                                                          1997         1996
                                                      ----------    -----------

NET SALES                                             $ 8,448,349   $ 7,561,793

COST OF SALES                                           2,925,297     2,710,869
                                                      -----------   -----------
        Gross profit                                    5,523,052     4,850,924
                                                      -----------   -----------
OPERATING EXPENSES:
    Research and development                              556,150       398,510
    Selling and marketing                               1,812,969     1,794,576
    General and administrative                          1,341,997     1,050,831
                                                      -----------   -----------
        Total operating expenses                        3,711,116     3,243,917
                                                      -----------   -----------
        Operating income                                1,811,936     1,607,007

OTHER INCOME (EXPENSE):
    Interest income                                       251,234       258,865
    Interest expense                                     (404,710)     (444,727)
    Currency gains (losses)                                 1,567        (3,794)
    Other, net                                            (16,239)       (1,526)
                                                      -----------   -----------
        Total other (expense)                            (168,148)     (191,182)
                                                      -----------   -----------
        Earnings before income taxes                    1,643,788     1,415,825


INCOME TAXES                                              672,208       573,079
                                                      -----------   -----------
        Net earnings                                  $   971,580   $   842,746
                                                      ===========   ===========

BASIC WEIGHTED AVERAGE NUMBER
    OF COMMON SHARES OUTSTANDING                       14,369,395    14,280,654
                                                       ==========    ==========

BASIC EARNINGS PER COMMON SHARE                       $       .07   $       .06
                                                      ===========   ===========

DILUTED WEIGHTED AVERAGE NUMBER OF
    COMMON SHARES OUTSTANDING                          14,711,905    14,735,225
                                                      -----------   -----------

DILUTED EARNINGS PER COMMON SHARE                     $       .07   $       .06
                                                      -----------   -----------

                                  Page 5 of 13







                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES
                      Consolidated Statements of Cash Flows
                                   (Unaudited)
                                                          Three Months Ended
                                                             December 31,
                                                   -----------------------------
                                                        1997            1996
                                                   ------------    -------------
CASH FLOWS FROM OPERATING ACTIVITIES:
    Net earnings                                   $    971,580    $    842,746
    Noncash items-
       Depreciation of property, plant
          and equipment                                 338,562         273,319
       Amortization of intangible assets
          and deferred royalties                        389,425         498,101
       Deferred interest expense                              0          41,646
       Deferred income taxes                           (141,058)         10,494
    Change in current assets excluding
       cash/cash equivalents and investments             89,384         513,047
    Change in current liabilities, excluding
       current portion of long term obligations         712,246       1,096,054
    Long term receivable and payable                      2,001          27,966
                                                    -----------     -----------
       Net cash provided by operating activities      2,362,140       3,303,373
                                                    -----------     -----------
CASH FLOWS FROM INVESTING ACTIVITIES:
    Property, plant and equipment acquired, net        (434,141)       (142,765)
    Sale (purchase) of investments                     (440,850)      8,025,890
                                                    -----------     -----------
       Net cash provided by (used for)
         investing activities                          (874,991)      7,883,125

CASH FLOWS FROM FINANCING ACTIVITIES:
    Subordinated debentures offering costs                    0         (66,293)
    Proceeds from other long-term obligations           174,701            --
    Repayment of long-term obligations                 (108,955)        (60,769)
    Dividends paid                                     (970,087)       (856,804)
    Proceeds from issuance of common stock, net           5,868          25,359
                                                    -----------     -----------
       Net cash provided by (used for)
         financing activities                          (898,473)       (958,507)
                                                    -----------     -----------
    Effect of exchange rate changes on cash             (58,094)          7,656
                                                    -----------     -----------
NET INCREASE (DECREASE) IN CASH
  AND CASH EQUIVALENTS                                  530,582      10,235,647

CASH AND CASH EQUIVALENTS
  AT BEGINNING OF PERIOD                             10,523,191       5,648,225
                                                    -----------     -----------
CASH AND CASH EQUIVALENTS
  AT END OF PERIOD                                 $ 11,053,773    $ 15,883,872
                                                   ============    ============
SUPPLEMENTAL DISCLOSURE OF
  CASH FLOW INFORMATION:
    Cash paid during the period for-
       Income taxes                                $    400,110    $    119,050
       Interest                                          65,694          18,247
                                                   ============    ============


                                  Page 6 of 13







                   MERIDIAN DIAGNOSTICS, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements
                                   (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 disclosures 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 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.


(2)  Inventories-
     ------------

     Inventories are comprised of the following:

                                         December 31,        September 30,
                                             1997                 1997
                                         ------------        -------------
       Raw materials                     $1,325,653            $1,399,188
       Work-in-process                    1,408,507             1,652,270
       Finished goods                     1,784,931             1,600,229

                                         $4,519,091            $4,651,687



(3)  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.

                                  Page 7 of 13





(4)  Earnings Per Common Share-
     --------------------------

     Basic  earnings per common share were  computed by dividing net earnings by
     the weighted  average number of shares of common stock  outstanding  during
     the quarter.  Diluted  earnings per common share were  computed by dividing
     net earnings by the sum of the weighted  average number of shares of common
     stock outstanding plus outstanding stock options, which are the only common
     stock   equivalent.    The   convertible    subordinated   debentures   are
     anti-dilutive.  The Company  adopted  SFAS No. 128,  "Earnings  Per Share",
     effective October 1, 1997. As a result, the Company's reported earnings per
     share for the quarter ending December 31, 1996 were restated. The effect of
     this change on  previously  reported  earnings  per share (EPS) data was as
     follows:

                                                          Quarter Ending
       Per Share Amounts                                     12/31/96
       ------------------------------                     --------------

       Primary EPS as reported                                  $0.06
       Effect of SFAS No. 128                                      -
                                                                -----
       Basic EPS as restated                                    $0.06
                                                                =====

       Fully diluted EPS as reported                             n/a
       Effect of SFAS No. 128                                      -
                                                                -----
       Diluted EPS as restated                                  $0.06
                                                                =====

(5)  Translation of Foreign Currency-
     --------------------------------

     Assets and liabilities of foreign  operations are translated  using quarter
     end exchange rates, and revenues and expenses are translated using exchange
     rates  prevailing  during  the year  with  gains or losses  resulting  from
     translation included in a separate component of shareholders' equity. Gains
     and  losses  resulting  from   transactions  in  foreign   currencies  were
     immaterial.

(6)  Reclassifications
     -----------------

     Certain reclassifications have been made to the December 31, 1996 financial
     statements to conform to the December 31, 1997 presentation.

(7)  Recently Issued Accounting Standards
     ------------------------------------

     During  1997,  the  Financial  Accounting  Standards  Board  (FASB)  issued
     Statement  No. 130  (Statement  130) on "Reporting  Comprehensive  Income".
     Statement 130 is effective for the fiscal years  beginning  after  December
     15, 1997,  or for  Meridian's  fiscal year ended  September  30, 1999.  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 is the total of net  income  and all other
     non-owner changes in equity.  For the Company,  this reporting will involve
     gains and losses  resulting from the  translation of assets and liabilities
     of foreign  operations which are currently included in a separate component
     of shareholders'  equity. In addition, it will include unrealized gains and
     losses  on  investments.  Based on  current  circumstances,  the  effect of
     Statement 130 will not have a material  impact on the  Company's  financial
     position or operating results.

                                  Page 8 of 13







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


Results of Operations
- ---------------------

Net sales increased $887,000, or 12%, to $8,448,000 for the first fiscal quarter
compared to the prior year.  This increase is attributable to unit growth in the
H. pylori,  C.  difficile,  ParaPakR  and  Mycoplasma  lines which  collectively
increased  $877,000,  or 21%. The Giardia and virology  lines combined were down
about 17% versus the prior year while all other product lines in total increased
approximately 4%. Premier PlatinumR HpSA (H. pylori Specific Antigen),  launched
in Europe in  September  1997 and sold in the U.S. for research use only pending
Food and Drug  Administration  clearance,  attained first quarter sales of about
$130,000.

The increase in sales of $887,000 was  attributable  to strong  volume growth of
$1,383,000,  or 18%,  offset by pricing of ($306,000),  or (4)%, and currency of
($109,000), or (2)%, respectively.

European sales decreased  approximately $110,000 for the quarter due entirely to
the impact of currency from the stronger  dollar  versus the lira.  Adjusted for
currency,  European sales were up about 5% over the prior year. Premier Platinum
HpSA is growing  rapidly in Europe,  achieving  about $90,000 in sales following
introduction in September 1997.

The impact of pricing  for the  quarter  has  softened  somewhat  from  previous
quarters,  however,  reflects in part four new national  contracts  which became
effective  after December 1996, and the addition of other products to previously
existing  contracts.  The balance of the pricing  relates to competitive  market
conditions, primarily in the U.S. and Europe.

Gross profit increased  $672,000,  or 14%, compared to the sales increase of 12%
and  improved  1.2  points as a  percentage  of net sales to 65.4% for the first
fiscal  quarter  compared to 64.2% for the three months ended December 31, 1996.
The  improvement  reflects in part the higher  margin on the  Cambridge  line of
enteric  products  which are now  produced  entirely in the  Company's  facility
versus  the  previously  higher  cost  associated  with the one  year  inventory
purchase   agreement  when  the  products  were  acquired  in  June  1996.  Also
contributing  to this  improvement  was the reduction in amortization of certain
acquisition  costs  related to the  Cambridge  supply  agreement  and  inventory
purchase  agreement.   Increases  in  scrap/obsolescence   costs,  higher  sales
royalties  and the  impact of  pricing  noted  above  partially  offset the cost
improvements.

Total  operating  expenses  increased  $467,000,  or 14%,  for the first  fiscal
quarter  versus the prior year, and increased one point as a percent of sales to
43.9% from 42.9% versus the same period last year.

Research  and  development  expenses  for the  first  fiscal  quarter  increased
$158,000,  or 40%, from the prior year. This increase is more than accounted for
by the cost of  clinical  studies,  primarily  the  Phase I  multi-site  Premier
Platinum  HpSA  studies.  Selling and  marketing  expenses are  relatively  flat
compared  to the first  fiscal  quarter of last year,  up  $18,000,  or 1%. U.S.
expenses increased  approximately  $90,000, or 6%, but were offset by a decrease
in European  expenses of about  $70,000,  the  majority  being  attributable  to
currency as a result of the significant  strengthening  of the dollar versus the


                                  Page 9 of 13







lira. General and administrative  expenses increased  $291,000,  or 28%, for the
first fiscal  quarter.  These increases are  attributable  to personnel  related
expenses,  depreciation and maintenance  contract expenses for the upgraded main
frame  computer,  an increase in the allowance for doubtful  accounts and higher
outside legal expenses  associated with patent filings.  European  expenses were
down nominally, but up adjusted for currency.

Operating  income as a result of the above increased  $205,000,  or 13%, for the
first  fiscal  quarter  and  remained  fairly  constant as a percent of sales at
21.5%.

Other expense  decreased $23,000 for the quarter which is due primarily to lower
interest  expense.  Gains/(losses)  in foreign exchange were not material during
the periods. The cumulative foreign currency  translation  adjustment changed by
$89,000 during the quarter as a result of the U.S. dollar strengthening  against
the lira compared to September 30, 1997.

The  Company's  effective  tax rate  increased  less than  one-half of one point
compared to the prior year.


Liquidity and Capital Resources
- -------------------------------

Net cash flows provided by operations  declined $941,000,  or 28%, to $2,362,000
for the quarter ended  December 31, 1997.  The increase in net working  capital,
primarily in accounts  receivable  associated with the higher sales, a reduction
in  inventories  associated  with the Cambridge  acquisition in June 1996, and a
reduction  in accounts  payable  versus the prior  year,  also  associated  with
Cambridge, were responsible for the lower operational funds flow.

Net cash used for investing  activities  increased $8,758,000 mainly as a result
of the sale of  short-term  investments  of  $8,026,000  in the prior year.  The
majority  of the  balance  of cash  used for  investing  activities  relates  to
property, plant and equipment additions. Funds used for financing activities are
relatively  consistent  with the prior  year and  largely  related  to  dividend
payments.

Net  cash  flows  from   operations  is  anticipated  to  fund  working  capital
requirements  for the  balance of the fiscal  year.  The  Company  has an unused
$12,500,000 line of credit with a commercial bank and cash/cash  equivalents and
short-term investments of $22,708,000 at December 31, 1997.



                                  Page 10 of 13








                           PART II. OTHER INFORMATION


Item 5.  Other Information

    On October 22, 1997 the Company  announced  that it had signed a  multi-year
agreement  for the  distribution  of selected  rapid  diagnostics  tests through
Physician Sales and Service (PSS), Jacksonville, Florida. Under the terms of the
three-year  agreement  PSS will have  exclusive  physician  office  distribution
rights  to  Meridian's   rapid,   one-minute   urinary  tract   infection   test
FiltraCheck-UTIR,  and,  non-exclusive  distribution  rights to distribute other
rapid  tests  including   technologies   for  detecting   mycoplasma   ("walking
pneumonia"),  infectious mononucleosis,  H. pylori (stomach ulcers), and certain
other products.

    The  Company was  selected  by Forbes  magazine as one of the 200 Best Small
Companies  in  America  for the  second  year  in a row.  According  to  Forbes,
companies  are  selected  based  upon  a set of  factors  including  growth  and
profitability,  plus various  stock  market  factors.  The analysis  prepared by
Forbes indicated a 17.8% five-year average return on equity (ROE) for Meridian.

    The Company  announced on December  30, 1997 that its  European  subsidiary,
Meridian  Diagnostics  Europe (MDE), was certified as successfully  implementing
formal quality assurance systems that conform to Internal Standards Organization
(ISO) Series 9002.  Notification from the independent,  non-profit federation of
Italian  organizations,  known as CISQ,  was received on December 19th 1997. ISO
9002  is  an  internationally  recognized  set  of  standards  which  have  been
established  to  maintain  the  highest  levels of  quality  through  continuous
improvement and adherence to total quality management.

    On January 6, 1998 the Company  announced  that it had submitted to the Food
and Drug Administration (FDA) Premier Platinum HpSA, a unique noninvasive patent
pending test for the detection of helicobacter  pylori  antigens,  for marketing
clearance. The test is performed on a stool specimen and requires about one hour
for final results. The H. pylori bacteria is now recognized as the leading cause
of  peptic  ulcer  disease  and  recently  has  been  classified  as a  definite
carcinogen  associated with diseases such as gastric  adenocarcinoma and gastric
lymphoma.  According  to  estimates  from the Centers  for  Disease  Control and
Prevention,  25 million persons in the United States,  where infection rates are
30-40% of the population,  have had peptic ulcer disease during their lifetimes.
International  infection rates can exceed 80%,  especially among the populations
of Asian and Latin American Countries.




                                  Page 11 of 13








Item 6.  Exhibits and Reports on Form 8-K.

         (a)      Exhibits-

         Exhibit No.                 Description                         Page(s)
         -----------   ----------------------------------------          -------

             11        Computation of earnings per common share              13
             27        Financial Data Schedule                            14-16


         (b)   Reports on Form 8-K - None


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.




Date:    January 29, 1998                   /S/     GERARD BLAIN
                                            -----------------------------------
                                            GERARD BLAIN, Vice President,
                                            Chief Financial Officer (Principal
                                            financial officer)



                                  Page 12 of 13