<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS OF PATHOGENESIS CORPORATION FOR THE
NINE MONTHS ENDED SEPTEMBER 30, 1998, AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                       3,147,983
<SECURITIES>                                54,976,517
<RECEIVABLES>                                7,512,033
<ALLOWANCES>                                         0<F1>
<INVENTORY>                                  9,891,098
<CURRENT-ASSETS>                            77,768,147
<PP&E>                                      25,151,118
<DEPRECIATION>                               8,943,806
<TOTAL-ASSETS>                             109,543,201
<CURRENT-LIABILITIES>                       15,297,138
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        16,273
<OTHER-SE>                                  89,606,161
<TOTAL-LIABILITY-AND-EQUITY>               109,543,201
<SALES>                                     42,921,866
<TOTAL-REVENUES>                            43,215,430
<CGS>                                        6,946,023
<TOTAL-COSTS>                               47,078,922
<OTHER-EXPENSES>                               105,537
<LOSS-PROVISION>                                     0<F2>
<INTEREST-EXPENSE>                             281,496
<INCOME-PRETAX>                            (1,035,644)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (1,035,644)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (1,035,644)
<EPS-PRIMARY>                                   (0.06)
<EPS-DILUTED>                                   (0.06)
<FN>
<F1>THE AMOUNT OF RECEIVABLES REPORTED IS NET OF $1,391,824 OF ALLOWANCES.
<F2>THE TOTAL COSTS INCLUDE LOSS PROVISION OF $173,175.
</FN>