<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS OF PATHOGENESIS CORPORATION FOR THE
SIX MONTHS ENDED JUNE 30, 1999, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                       4,480,597
<SECURITIES>                                37,033,085
<RECEIVABLES>                                4,450,155
<ALLOWANCES>                                         0<F1>
<INVENTORY>                                 15,652,052
<CURRENT-ASSETS>                            63,866,425
<PP&E>                                      29,321,215
<DEPRECIATION>                              11,229,185
<TOTAL-ASSETS>                              97,677,613
<CURRENT-LIABILITIES>                       10,803,772
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        16,395
<OTHER-SE>                                  86,857,446
<TOTAL-LIABILITY-AND-EQUITY>                97,677,613
<SALES>                                     24,121,584
<TOTAL-REVENUES>                            24,561,447
<CGS>                                        4,748,990
<TOTAL-COSTS>                               32,807,678
<OTHER-EXPENSES>                               112,584
<LOSS-PROVISION>                                     0<F2>
<INTEREST-EXPENSE>                             401,669
<INCOME-PRETAX>                            (7,237,263)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (7,237,263)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (7,237,263)
<EPS-BASIC>                                     (0.44)
<EPS-DILUTED>                                   (0.44)
<FN>
<F1>THE AMOUNT OF RECEIVABLES REPORTED IS NET OF $1,927,416 OF ALLOWANCES.
<F2>THE TOTAL COSTS INCLUDE LOSS PROVISION OF $78,231.
</FN>