CHIRON CORP
8-K/A, EX-13.1, 2000-12-01
PHARMACEUTICAL PREPARATIONS
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                                                                    Exhibit 13.1

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 10-K

  [X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE
                                   ACT OF 1934

                   For the Fiscal Year Ended December 31, 1999

                                       OR

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

                         Commission File Number 0-27150

                               ------------------

                            PATHOGENESIS CORPORATION
             (Exact name of Registrant as specified in its charter)

                Delaware                                91-1542150
  (State or other jurisdiction of                   (I.R.S. Employer
   incorporation or organization)                 Identification Number)

               201 Elliott Avenue West, Seattle, Washington 98119
               (Address of Principal Executive Offices) (Zip Code)

       Registrant's telephone number, including area code: (206) 467-8100

                               ------------------

        SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT: NONE

           SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:

                       Common Stock, $0.001 par value per
                share Preferred Stock Purchase Rights (currently
                            traded with Common Stock)
                              (Title of Each Class)

                               ------------------

Indicate by 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 by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of Registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

The aggregate market value of the voting stock of the Registrant held by
stockholders who were not affiliates (as defined by regulations of the
Securities and Exchange Commission) of the Registrant was approximately
$393,223,924 on March 17, 2000 (based on the closing price quoted on the Nasdaq
National Market on March 17, 2000, as reported by The Wall Street Journal). On
March 17, 2000, the Registrant had issued and outstanding an aggregate of
16,506,407 shares of common stock.

                       Documents Incorporated by Reference

Those portions of the Registrant's proxy statement to be filed pursuant to
Regulation 14A for the annual meeting of stockholders to be held on May 31,
2000, described in Part III hereof, are incorporated by reference in this
report.


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                                     PART I

         In addition to historical information, this annual report on Form 10-K
contains forward-looking statements. You may identify these forward-looking
statements by the use of such words as "believe," "anticipate," "expect," "plan"
and "intend." Since these statements are based on factors that involve risks and
uncertainties, they do not necessarily indicate what our actual future results
will be. Factors that could cause or contribute to differences between our
actual results and the results expressed or implied by the forward-looking
statements include, but are not limited to, those discussed in "Item 1.
Business" and "Item 7. Management's Discussion and Analysis of Financial
Condition and Results of Operations" of this Form 10-K, and in Exhibit 99.1 to
this Form 10-K. These factors include, but are not limited to, uncertainties
related to the fact that PathoGenesis only began commercial operations in 1998,
its dependence on TOBI, the degree of penetration of its markets and frequency
of TOBI's use by patients, risks associated with marketing TOBI in international
markets, third party reimbursement and product pricing, seasonal impacts on
hospitalizations or exacerbations experienced by patients, variability in
wholesaler ordering patterns, drug development and clinical trials, uncertain
outcome of the U.S. and international drug approval process, competition and
alternative therapies. We cannot assure you that TOBI - which is currently our
only product - will penetrate markets as planned, that our development of TOBI
for other uses will succeed or occur within anticipated time frames, or that we
will develop any of our other drug candidates successfully.

Item 1.         Business

Summary

         PathoGenesis Corporation develops and markets drugs to treat infectious
diseases - particularly serious lung infections - where there is a significant
need for improved therapy.

         Our drug TOBI(R) (tobramycin solution for inhalation) was initially
tested and approved for cystic fibrosis (CF) patients with Pseudomonas
aeruginosa lung infections. TOBI has been on the market in the U.S. since
January 1998. Sales are growing as market penetration of the drug increases in
the U.S. and other countries where TOBI has been approved for sale. According to
industry data, pseudomonal bacteria infect the lungs of about 60% of the 70,000
people worldwide with CF. Our market surveys indicate that TOBI also is being
used by non-CF patients with similar respiratory infections.

         In 2000, PathoGenesis intends to make significant investments in
research and development (R&D) to enhance our company's future sales potential,
both in CF and in new markets. Our planned R&D programs include:

-        conducting or co-sponsoring clinical trials of TOBI in a variety of
         groups, including CF, bronchiectasis, ventilator-associated pneumonia
         (VAP) and lung transplant patients.

-        pursuing development and registration of a product combining TOBI and
         the portable AeroDose Inhaler, a hand-held, portable delivery device
         made by AeroGen, Inc. Our goal is to deliver TOBI to the lungs in 5-10
         minutes or less versus the current 15-20 minutes.

-        beginning Phase I clinical trials of PA-1806 for inhalation. This drug
         candidate was licensed from Bristol-Myers Squibb and has a different
         mechanism of action from TOBI, potentially allowing it to be used for
         treating serious lung infections in combination with TOBI or in
         alternating cycles.

-        initiating preclinical development of at least one additional
         antibiotic for inhalation to address broader respiratory infection
         markets.

-        collaborating with Chiron Corp. to develop new antibiotics with new
         mechanisms of action to better address serious medical needs,
         particularly concerns about drug resistance. The collaboration was
         formed to combine our strengths in identifying novel antibiotic
         targets, assays and drug development and knowledge of the P. aeruginosa
         genome (DNA or genetic code) with Chiron's strong combinatorial
         chemistry library and expertise in high- throughput screening.

         PathoGenesis was incorporated in 1991 as a Delaware corporation. Our
executive offices are located at 201 Elliott Avenue West, Seattle, Washington
98119. Our telephone number is (206) 467-8100.



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Overview: Inhaled Drug Development Program

         Our goal is to develop drug candidates that can provide significant
benefit to people with difficult-to-treat lung infections, including people with
cystic fibrosis, bronchiectasis, ventilator-associated pneumonia and lung
transplants. Many of these serious infections are caused by P. aeruginosa, a
common gram- negative pathogen. In 1999, we completed our analysis of P.
aeruginosa's genetic structure in collaboration with the University of
Washington Genome Center and the Cystic Fibrosis Foundation. Our first drug,
TOBI, is an inhaled antibiotic that was developed to treat pseudomonal lung
infections.

         In 1993, we began researching inhaled antibiotics in order to deliver
drugs directly to the site of infection in the lungs, rather than systemically
through the blood. Our researchers believed a much larger dose could be safely
delivered to the lungs if systemic absorption could be limited. Antibiotics
administered intravenously or orally (in tablet or capsule form) must travel
through the bloodstream and lung tissue to reach the site of most lung
infections. In the case of intravenous tobramycin, higher levels of drug in the
bloodstream lead to adverse side effects - hearing loss and kidney damage.

         TOBI is the first inhaled antibiotic solution to be approved by the
Food and Drug Administration. To achieve that, we had to develop a
preservative-free sterile formulation of tobramycin for inhalation, find a
suitable nebulizer (device used to produce an antibiotic aerosol mist), conduct
multiple clinical trials and gain regulatory approval of TOBI. Before our Phase
III clinical trials of TOBI began in 1995, we chose the Pari LC Plus nebulizer
for use with TOBI because it could efficiently deliver the correct particle size
of drug to the lungs. Antibiotic particles that are too large can get caught in
the back of the throat and the upper airways. Particles that are too small are
deposited predominantly in the alveoli (air sacs), which increases systemic
absorption and does not allow the drug to reach the site of infection in the
airways of the lung.

         Since we began developing TOBI in 1993, drug delivery companies have
invented new generations of nebulizers and dry powder delivery devices which are
hand-held, portable and do not require the use of an electrically powered air
compressor. One such device is the AeroDose Inhaler, made by AeroGen, Inc. We
are working with AeroGen to develop and register a product combining TOBI and a
customized version of the AeroDose Inhaler. Our goal is to improve convenience
and deliver TOBI to the lungs in 5-10 minutes or less, versus the current 15-20
minutes.

         In addition to TOBI, we are conducting preclinical research on PA-1806,
a novel, patented drug candidate that was licensed from Bristol-Myers Squibb in
1998. In the laboratory, PA-1806 has demonstrated activity against gram-negative
lung pathogens.

         This year, we intend to initiate a preclinical program on at least one
other antibiotic for inhalation. Our objective is to address broader respiratory
infection markets with a drug candidate that has demonstrated activity against
both gram-negative and gram-positive lung pathogens.

TOBI and the Cystic Fibrosis Market

         TOBI is a stable, premixed, proprietary formulation of the antibiotic
tobramycin for delivery by inhalation using a nebulizer. Each ready-to-use
ampule of TOBI contains 300 milligrams of tobramycin in a 5 milliliter solution.
TOBI is administered using a Pari LC Plus reusable nebulizer and a DeVilbiss
Pulmo-Aide air compressor. It is inhaled in two daily sessions requiring 15-20
minutes per session. The TOBI treatment regimen consists of repeated cycles of
28 days on drug, followed by 28 days off drug. This regimen was proven safe and
effective in clinical trials.

         Tobramycin is a fermentation product isolated from Streptomyces
tenebrarius in 1967. It is a water-soluble compound belonging to the group of
antibiotics called aminoglycosides. Like other aminoglycosides, tobramycin
inhibits bacterial protein synthesis and is most active against gram-negative
bacteria. Compared with other aminoglycosides, tobramycin is more active against
P. aeruginosa by at least two-to four-fold and is generally less toxic.
Intravenous tobramycin has been approved for marketing for more than 20 years.

         TOBI has been designated an orphan drug by the U.S. Food and Drug
Administration (FDA), which gives us seven years of marketing exclusivity in the
U.S. from the time of TOBI's approval in late 1997. TOBI also is covered by
formulation patents in various countries. PathoGenesis has an exclusive
worldwide license from Children's Hospital and Medical Center in Seattle (based
on Phase II research done there and in other clinics) for patents, research and
technology relating to the use of an aerosol tobramycin solution or any other
aerosol aminoglycoside solution for the treatment of bronchopulmonary
infections.




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<PAGE>


       Cystic Fibrosis Lung Infections

       Cystic fibrosis is the most common life-shortening inherited disease in
the U.S., affecting about 30,000 Americans. According to the Cystic Fibrosis
Foundation, CF is diagnosed in one of every 3,300 newborns in the U.S. The
median survival age is about 32 years. About two-thirds of CF patients in the
U.S. are treated at more than 110 centers accredited by the Cystic Fibrosis
Foundation.

       About 40,000 CF patients live outside the U.S. The disease is most
prevalent in Europe, Canada, Australia and other countries where Caucasians
have immigrated, because CF is primarily a Caucasian genetic disease.
Although the incidence of CF in those countries is similar to the U.S., life
expectancy can vary from country to country depending on the caliber of care.
Most countries have CF centers comparable to those in the U.S.

        CF is characterized by the production of unusually thick, sticky mucus
that obstructs the airways of the lungs, the bronchial tubes and bronchioles.
Early in life, CF patients typically have bacterial infections comparable to
other children. Although the majority of their early lung infections are treated
effectively, the accumulation of mucus in the lungs usually leads to life-long
infections. This results in gradual destruction of lung tissue, and eventually,
respiratory failure. P. aeruginosa is the dominant bacterium and infects the
lungs of about 60% of all people with CF in the U.S. Infection with pseudomonal
bacteria is increasingly likely as the patient ages. Furthermore, P. aeruginosa
is rarely if ever permanently eradicated after antibiotic treatment.

        An estimated 90% of all illnesses associated with CF are related to the
respiratory system. Periodic flare-ups of pseudomonal infection can cause life-
threatening episodes and hospitalization, which increases treatment costs,
exposes the patient to potential hospital-acquired infections, and disrupts
education and family life. For more than 20 years, the standard treatment for
those flare-ups was intravenous tobramycin, typically for periods of 10-14 days.
However, cumulative systemic exposure to intravenous tobramycin increases the
risk of adverse side effects, such as significant kidney damage and hearing
loss.

       TOBI for Cystic Fibrosis Lung Infections

       As an antibiotic specifically formulated for inhalation, TOBI is
delivered directly to the lungs where the infection resides. The drug is
formulated to minimize its absorption into the bloodstream, thereby reducing the
risk of adverse effects. On average, 100-fold greater concentrations of
tobramycin can be delivered to the actual site of infection by directly
depositing the antibiotic on the airway lining as compared with intravenous
delivery. Treatment of pseudomonal infection using TOBI would be expected to
begin at the first detection of pseudomonal bacteria and may continue throughout
the patient's lifetime. We believe the market for TOBI is significant and
growing. Industry data indicate that pseudomonal bacteria infect the lungs of
about 60% of the 70,000 people worldwide with CF. Market growth may occur as new
patients are diagnosed and improved therapy extends the lives of patients.

       In an article on TOBI published in The New England Journal of Medicine,
Jan. 7, 1999, the authors wrote: "Our study shows that long-term, intermittent
administration of inhaled tobramycin in conjunction with standard therapy for CF
improves pulmonary function, decreases the density of P. aeruginosa in
expectorated sputum, and reduces the need for intravenous antipseudomonal
antibiotics and hospitalization." The article described the Phase III clinical
trials of TOBI, which comprised the largest study of inhaled antibiotics to
date.

       All patients who completed the six-month Phase III clinical trials were
eligible for a series of follow-on studies, allowing them to continue inhaling
TOBI in repeated cycles of 28 days on drug, 28 days off drug for up to two years
(96 weeks). Among the results announced in 1999:

-      Patients breathe better. At the end of the last on-drug cycle (after 92
       weeks), average lung function remained nearly 5% above baseline (at week
       0) -a significant achievement considering that most CF patients typically
       lose lung function over that same period of time.

-      Adolescents (ages 13 to 17) had the largest improvement in their ability
       to breathe when compared with the other age groups, showing a treatment
       effect of about 14% in lung function improvement above baseline at the
       end of the last on-drug cycle. The typical teenager loses lung function
       more rapidly than an older or younger person with CF.

-      Patients live better. In every season, TOBI reduced the number of days
       patients were hospitalized. TOBI produced the largest effect during the
       fall season, the time of year when CF patients are most frequently
       hospitalized for exacerbations or flare-ups of pulmonary symptoms. After
       two years, study results showed a 62% reduction in the number of days
       patients on


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       TOBI (versus placebo) were hospitalized in October, November
       and December.

-      Patients enjoy better nutritional status. Teenagers in the TOBI clinical
       trial dramatically demonstrated the benefits of improved infection
       control. After six months of TOBI therapy, adolescent patients had a mean
       weight gain of about five pounds, while placebo patients only gained
       about two pounds. After 18 months of TOBI therapy, adolescent patients
       had a mean weight gain of nearly 10 pounds above baseline. No weight
       differential was seen in other age groups when comparing the TOBI and
       placebo groups. Weight gain is an important indicator of nutritional
       status and is associated with improved prognosis in CF patients.

-      TOBI was shown to be safe for long-term treatment. In the six-month
       placebo-controlled portion of the study, voice alteration (e.g.,
       hoarseness) and tinnitus (ringing in the ears) were the only adverse
       experiences reported by significantly more TOBI patients than patients
       receiving placebo plus usual care. In the two-year follow-on studies,
       most adverse events declined with increased TOBI exposure.

       The emergence of drug-resistant bacteria is a concern with long-term
administration of any antibiotic. However, intravenous tobramycin therapy for
acute flare-ups of pseudomonal infection in CF patients is usually efficacious,
even though resistant pseudomonal bacteria are frequently found. Treatment for
six months with TOBI in the clinical trials did not affect the susceptibility of
the majority of P. aeruginosa isolates tested. However, microbiological measures
of increased drug resistance were noted in some patients. The relationship of in
vitro (laboratory) susceptibility test results and clinical outcome with TOBI
therapy has not been established. In fact, the 24-month data on TOBI show
positive clinical responses in those few patients with pseudomonal bacteria
considered resistant by traditional intravenous measures.

       Broadening the CF Market for TOBI

       The two-year clinical trial of TOBI tested our drug in patients with
severe or moderate impairment of lung function, defined as lung function of 25%
to 75% of normal levels. Although TOBI has been approved for use by all CF
patients with P. aeruginosa lung infections, without limitations based on lung
function level, we believe that U.S. physicians to date have been most likely to
prescribe TOBI to patients with moderate to severe lung function impairment. In
addition, our market research indicates that those are the patients most likely
to use TOBI as approved versus for acute or episodic treatment of pulmonary
exacerbations. The approved regimen (twice a day for 28 days on drug, 28 days
off drug) would require U.S. patients to purchase about six cartons of TOBI per
year; a carton contains a 28-day supply or 56 ampules (vials) of TOBI. Acute or
episodic use of TOBI might typically require as little as one carton a year or
as many as 3-4 cartons.

       To further expand the CF market for TOBI, we intend to continue our
education and outreach programs for physicians, other CF care professionals and
patients. In addition, we plan to conduct or co-sponsor additional clinical
trials. For example, this year we plan to conduct a clinical trial in CF
patients age six through 15 with mild pulmonary symptoms. Our goal is to verify
in this subset of CF patients that chronic intermittent use of TOBI will improve
pulmonary function versus the decline seen with standard care. See "Sales and
Marketing." We also expect to announce new TOBI data in 2000, including results
of a clinical trial in 22 of the U.K.'s 44 CF centers.

Other Potential Markets for TOBI

       Our market surveys reveal that TOBI is being used by non-CF patients with
serious and/or chronic respiratory infections. We believe that the
pulmonologists who treat CF patients are the most likely to prescribe TOBI for
other patients with similar respiratory infections. In 2000, PathoGenesis
intends to conduct or co-sponsor a number of clinical trials of TOBI in a number
of these patient groups, including bronchiectasis, ventilator-associated
pneumonia and lung transplant patients.

       Bronchiectasis

       Bronchiectasis is an abnormal enlargement of the bronchi that induces or
follows chronic infection of the airways. The airways frequently contain large
amounts of thick, pus-containing mucus, causing patients to experience incessant
coughing and difficulty in breathing. Often, many of the more distant airways
are blocked by secretions or completely destroyed and replaced by fibrous
tissue. Inflammation is caused by persistent bacterial infection in the lungs'
air passages, often with P. aeruginosa. In turn, that inflammation leads to
progressive lung damage. Damage may occur in both lungs or only one lung.
Although a small percentage of patients have localized damage that can be
treated successfully through surgery, most patients are treated with oral or
intravenous antibiotics, including macrolides, quinolones and aminoglycosides.
Severely affected patients may require multiple hospitalizations to treat
complications of the condition.

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       Causes of bronchiectasis include viral or bacterial pneumonia,
tuberculosis, primary ciliary disorders, exposure to toxic substances and
AIDS/HIV. As an anatomical condition, bronchiectasis can be definitively
diagnosed through CT scans, while chronic bronchitis is primarily diagnosed from
symptoms. Although the clinical manifestations of bronchiectasis are similar to
CF lung disease, bronchiectasis patients are usually older than age 50. The
condition affects 70,000 to 100,000 people in the U.S. alone, based on our
market studies and hospital discharge records. However, we believe
bronchiectasis is significantly underdiagnosed, in part, because symptoms and
treatments are similar for bronchiectasis and severe chronic bronchitis.

       The percentage of bronchiectasis patients infected with P. aeruginosa can
vary significantly by geography and practice setting (hospital versus office-
based practices). Published studies indicate pseudomonal infections can occur in
as many as 25% to 50% of bronchiectasis patients in hospital settings.
Bronchiectasis patients with moderate to severe disease are the most likely to
be infected with P. aeruginosa. Other bacteria that typically infect these
patients include Haemophilus influenzae, Streptococcus pneumoniae and
Staphylococcus aureus.

       Ventilator-Associated Pneumonia

       Our market studies indicate that annually, 150,000 to 230,000 patients on
ventilators in the U.S. develop ventilator-associated pneumonia. The risk of VAP
increases the longer the patient is on a ventilator. Pneumonia may be caused by
bacterial contamination of the ventilator circuit and respiratory therapy
equipment. The presence of invasive medical devices, such as tracheotomy tubes,
is another important contributor. Mortality in VAP patients is very high. VAP
also contributes to longer hospital stays and increased hospital costs.

       Most VAP infections are due to gram-negative bacteria, particularly those
occurring after 72 hours of mechanical ventilation. Bacteria associated with VAP
include P. aeruginosa and H. influenzae. Standard treatment is with a
combination of antibiotics, often including an intravenous aminoglycoside, such
as tobramycin.

       Lung Transplants

       An estimated 7,500 people in the U.S. have had lung transplants. People
with CF, idiopathic pulmonary fibrosis (IPF) and chronic obstructive pulmonary
disease (COPD) are among the patients who receive lung transplants or heart-lung
transplants. Those patients take medications to prevent tissue rejection, which
also depress the body's natural defenses against infection and create a greater
risk of serious lung infections. Furthermore, some patients continue to harbor
pseudomonal infections in their sinuses, increasing their risk of re-developing
chronic pseudomonal lung infections. The rate of infection among lung transplant
recipients is several times higher than the infection rate for recipients of
other organs, most likely related to the exposure of the lung graft to the
outside environment. The median survival of lung transplant patients is 3.8
years, with about 30% of deaths related to infection, according to the
International Society for Heart and Lung Transplants.

TOBI: The Next Generation

       Cystic fibrosis patients generally take a number of medications and other
treatments, even when they are feeling relatively well. A typical regimen
requires the patient to spend up to two hours in the morning and another 1-1/2
hours in the evening taking inhaled medications, oral
medications/enzymes/vitamins and chest physiotherapy, including the time needed
to clean nebulizers and other equipment between uses. Our market studies show
that the total time required for these treatments can have a dramatic impact on
the patient's compliance with the recommended TOBI treatment regimen and on the
physician's assessment of a patient's likelihood of compliance.

       Furthermore, bronchiectasis and other patients outside the CF market may
not be familiar with nebulizers and electrically powered air compressors and may
not be willing or able to take TOBI using the current delivery technology. As a
result, we believe the market for TOBI could be broadened significantly if we
can find a way to deliver an effective dose of TOBI more quickly by using a
hand-held, portable delivery device. Since we began developing TOBI in the mid-
1990s, drug delivery companies have invented new generations of hand-held
nebulizers and dry powder delivery devices that do not require the use of an air
compressor and could be suitable for inhaled antibiotics.

       One such hand-held, portable device is the AeroDose Inhaler, made by
AeroGen, Inc. We are collaborating with AeroGen on developing and registering a
product combining TOBI and a customized version of the AeroDose Inhaler. We
intend to begin a Phase I clinical trial of TOBI using the AeroGen device in the
second quarter of 2000. Our goal is to deliver TOBI to the lungs in 5-10 minutes
or less, versus the current 15-20 minutes.

Follow-On Drug Candidates to TOBI

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       We are developing other drug candidates in our planned portfolio of
antibiotics. The drug candidates would have different mechanisms of action from
each other and from TOBI, which could provide physicians with alternative or
alternating treatments.

       PA-1806

       About two-thirds of all antibiotics are beta-lactams, including
amoxicillin and ceftazidime. Beta-lactams work by interfering with the synthesis
of the bacterial cell wall, killing the pathogen rather than simply slowing its
growth. The monobactams are a subset of the beta-lactams and share a common core
structure (the beta-lactam ring) in their chemical makeup.

       PA-1806 is a patented new chemical entity in the monobactam class of
antibiotics that initially was synthesized by Bristol-Myers Squibb. In 1998,
PathoGenesis obtained an exclusive worldwide license from Bristol-Myers Squibb
for the aerosol use of PA-1806. A patent on the drug candidate (originally BMS-
180680) was issued in 1994 and will expire in 2011. We intend to begin Phase I
clinical trials of PA-1806 for inhalation in 2000. PA-1806 has a different
mechanism of action from TOBI, potentially allowing it to be used for treating
serious lung infections in combination with TOBI or in alternating cycles.

       PA-1806's spectrum of activity was evaluated in various studies conducted
by Bristol-Myers Squibb. In in vitro studies, PA-1806 was more active than
antibiotics currently in use against P. aeruginosa. In addition, PA-1806 was
active against Burkholderia cepacia and Stenotrophomonas maltophilia, pathogens
that are particularly problematic for people with CF. PA-1806 also has shown
efficacy against P. aeruginosa in animal models, including systemic and lung
infection models.

       In Phase I clinical trials, Bristol-Myers Squibb tested PA-1806 in
intravenous form in healthy volunteers. In intravenous form, the drug candidate
had an acceptable safety profile at blood levels above those anticipated to
reach circulation by aerosol delivery. However, the drug candidate's systemic
half-life in humans was less than one hour, making it unsuitable for intravenous
administration. On the other hand, rapid systemic clearance is not an issue in
topical aerosol delivery, and may in fact be beneficial.

       A Third, Broad-Spectrum Inhaled Antibiotic

       In early 2000, we announced plans to initiate preclinical development of
at least one other antibiotic for inhalation to address broader respiratory
infection markets. The ideal drug candidate would target both gram-negative and
gram-positive bacteria that cause serious infections, complementing TOBI and PA-
1806, which show activity primarily against gram-negative bacteria. Ideally,
this third drug candidate could be administered in five minutes or less using a
hand-held, portable drug delivery device. We consider a broad spectrum of
activity, speed of delivery and convenience to be important factors in treating
a wider spectrum of patients who have been diagnosed with serious or chronic
lung infections.

       Research and Development

       We focus our research and development on drug candidates with potentially
unique therapeutic profiles, as well as those we believe we can develop
relatively quickly. We seek to shorten drug discovery and development time by
involving our clinical and regulatory personnel in the early stages of drug
discovery and development. This allows us to choose drug candidates that are of
significant interest to physicians and regulators and that have readily
measurable effects in clinical trials. We intend to focus on drug candidates we
believe we can develop through our own resources, although we may also sell,
license, joint venture or otherwise collaborate where we determine such an
approach is preferable.

       Our expertise includes functional genomics and molecular target
discovery, assay development for compound screening, technology and informatics
to accelerate drug discovery, medicinal chemistry, compound evaluation in animal
infection models, and preclinical development capabilities. In addition, we have
developed specialized proficiency in the drug mechanisms of action and
resistance, inhaled drug delivery, surrogate markers and assays for clinical
trials, and clinical microbiology. We spent approximately $30.0 million, $33.0
million and $28.0 million on research and development of proposed drug
candidates in 1999, 1998 and 1997, respectively. The amount for 1998 includes
the $4.0 million initial fee to license PA-1806.

       In 1999, PathoGenesis, the Cystic Fibrosis Foundation and the University
of Washington Genome Center completed a two-year genomic research project on the
genetic makeup of P. aeruginosa, a bacterium that affects CF, burn and cancer
patients. This is the largest bacterial genome to be analyzed to date. Greater
knowledge of the bacterial genome has provided new insights into how P.
aeruginosa causes infection and defends itself against antibiotics. We are using
our P. aeruginosa database in molecular targeting by identifying and validating
a number of essential molecular mechanisms which are shared by P. aeruginosa and
other




                                       7
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bacteria and that are potential targets for drug activity. In addition, we
may seek to patent certain gene sequences that may help us develop and test drug
candidates. The genetic data derived from this Pseudomonas Genome Project are
published on the Internet at www.pseudomonas.com. From that site, researchers
around the world can download gene sequences to their own computers or use
resident software to search for similarities between a given gene and the
sequences contained in the P. aeruginosa database.



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       In early 2000, we announced a collaboration with Chiron Corp. Our joint
goal is to develop new antibiotics with new mechanisms of action to better
address serious medical needs, such as concerns about drug resistance. The
collaboration seeks to combine our strengths in identifying novel antibiotic
targets, assays and drug development and knowledge of the P. aeruginosa genome
with Chiron's strong combinatorial chemistry library and expertise in high-
throughput screening. Many of the antibacterial targets PathoGenesis has
identified to date are based on known essential biological processes. Knowledge
of those targets and of the relevant biological process allows the PathoGenesis-
Chiron research team to design and synthesize compounds that will inhibit,
interfere with, or block one or more essential functions in bacteria without
interfering with the function of human genes. Combinatorial chemistry allows us
to prepare vast numbers of compounds for screening, thereby increasing our
opportunities to discover novel antibiotics. Those compounds may be formulated
for oral, intravenous or inhaled administration.

Manufacturing

       We currently do not intend to establish internal manufacturing
capabilities. Instead, we have entered into contracts with third parties for the
production and packaging of TOBI. Contract manufacturing is monitored by our
manufacturing and distribution support operation in Annandale, New Jersey, which
had 22 employees as of year-end 1999. All manufacturing facilities used by
PathoGenesis are subject to inspection by the FDA or regulatory authorities in
other countries.

       We obtain bulk powdered tobramycin from two of the principal worldwide
suppliers of the drug, and anticipate that either one of those suppliers alone
will be able to supply sufficient quantities to meet our current needs. TOBI is
formulated and packaged at a U.S. facility that also packages other drugs for
inhalation for other pharmaceutical companies. The powdered tobramycin is mixed
with water and excipients, then injected into plastic ampules using a form-fill-
seal technology in a sterile environment. Each ampule has a snap-top access
port, simplifying the action of delivering TOBI directly into a nebulizer for
inhalation. Other contract manufacturers handle final packaging of the ampules
into aluminum foil pouches and cartons.

       Based upon our Phase III clinical trials of TOBI, we designated the Pari
LC Plus nebulizer to be used in TOBI treatments. This nebulizer is manufactured
and distributed in the U.S. by Pari Corporation of Germany. The nebulizer has a
useful life of about six months and costs about $15 U.S. at retail. Our research
shows that this nebulizer efficiently aerosolizes the TOBI solution and delivers
the optimal drug particle size to the lung airways, minimizing the amount of
drug that is absorbed systemically or coughed out. An electrically powered air
compressor also is required for TOBI treatments. CF patients may use nebulizers
and compressors for other types of inhaled treatments as well.

       We are investigating the commercial feasibility of delivering TOBI with
new generation delivery devices, and may in the ordinary course enter into
related arrangements with third parties.

Sales and Marketing

       Cystic fibrosis is a focused market segment comprised of a small group of
physicians and treating institutions in the U.S. and abroad. Many of those
pulmonologists also treat patients with bronchiectasis, ventilator-associated
pneumonia, lung transplants and related conditions.

       We had a U.S. sales force of 30 at year-end 1999. In the U.S., about two-
thirds of the 30,000 CF patients are treated by institutions or physicians
associated with about 110 CF care centers sponsored by the Cystic Fibrosis
Foundation. We have identified about 2,000 pulmonologists at those centers and
at office-based practices who care for patients with CF and related conditions
and who we believe would be the most likely to prescribe TOBI. Although TOBI has
been approved for use by all CF patients with P. aeruginosa lung infections,
without limitations based on lung function level, we believe that its usage to
date has been primarily in CF patients with moderate to severe lung function
impairment. In addition, these are the patients most likely to use TOBI as
approved (28 days on drug, 28 days off drug) versus for acute or episodic
treatment of pulmonary exacerbations. In 1999, we implemented a number of
education and outreach programs to help disseminate the positive results of our
TOBI studies, including the benefits of prescribing TOBI to younger patients
(particularly adolescents) and of using the drug in chronic intermittent cycles.
We expect to continue those marketing efforts in 2000.

       In the U.S., PathoGenesis sells TOBI to drug wholesalers and mail order
pharmacies. In 1999, sales to the three largest wholesale distributors accounted
for 64% of total sales. Pharmacies that sell TOBI accept assignment of benefits
and help patients request reimbursement from third party payors. TOBI has
achieved high reimbursement levels from third party payors, including private
insurance plans and Medicaid, which covers about 20% of CF patients. Our
revenues per carton of TOBI for patients covered by Medicaid are less than our
revenues per carton for other patients. If government and third-party payors do
not provide adequate coverage and reimbursement for TOBI, its market acceptance
would likely decline.


                                       9
<PAGE>


       Because TOBI has been on the market only since January 1998, we do not
know with certainty how sales may be affected by a number of factors and whether
such factors are sporadic, cyclical or have determinable trends. These factors
include: the seasonality arising from business cycles, weather, geographic
factors, cold and flu outbreaks, the impact of hospitalization or exacerbations
experienced by CF patients, compliance with chronic therapy (28 days on drug, 28
days off drug), physician and patient concerns about potential bacterial
resistance to TOBI, insurance reimbursement factors, variability in ordering
patterns by drug wholesalers, the effect of price increases and changes in
credit terms, and the approval, availability, efficacy and popularity of
alternative treatments. The interplay of those factors may cause fluctuations in
quarter-to-quarter sales. In addition, the effect those factors may have on
sales is likely to change as TOBI sales increase and our drug is introduced in
other countries. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations."

         In the second quarter of 1999, we received approval to market TOBI in
Canada, where there are about 3,500 CF patients, and Argentina, which has about
400 CF patients. We have a direct sales force of four in Canada and are selling
TOBI through a distributor in Argentina. Those countries have CF centers
comparable to those in the U.S.

       In the fourth quarter of 1999, we received approval to market TOBI in the
U.K., where there are about 6,500 CF patients, and Israel, where there are about
400 CF patients. We have a direct sales force of four in the U.K. and are
selling TOBI through a distributor in Israel. The U.K. is the lead country for
seeking regulatory approval of TOBI in the rest of the European Union through
the mutual recognition process. There are about 20,500 CF patients in those
other European Union countries, which generally have CF centers comparable to
those in the U.S. In anticipation of TOBI's eventual approval elsewhere in
Europe, we have opened offices in France and the Netherlands and announced
several exclusive distribution arrangements in various other countries for the
sale and distribution of TOBI.

       In 1999, we completed a 28-day open-label, randomized clinical trial of
120 cystic fibrosis patients at 22 CF centers in the U.K. and Ireland. That was
the largest study of nebulized antibiotics conducted in Europe to date. Although
the study was not required for regulatory approval, it provided European
clinicians experience with TOBI in their patients, as well as valuable data for
our marketing efforts in Europe. Study results are scheduled to be announced at
the 24th European Cystic Fibrosis Conference in June 2000.

       In the first quarter of 2000, we received approval to market TOBI in
Australia, where there are about 2,500 CF patients. We are selling TOBI through
a distributor in Australia, where TOBI is one of the first drugs to be
designated as an orphan drug.

Regulatory approvals do not necessarily indicate pricing or reimbursement
approvals.

Licenses and Other Agreements

       We have licensed from Children's Hospital and Medical Center in Seattle
exclusive worldwide rights to patents, research and technology relating to the
use of an aerosolized tobramycin solution or any other aerosolized
aminoglycoside solution for the treatment of bronchopulmonary infections.
PathoGenesis pays a royalty under the license based on net sales. The licensing
agreement continues in effect until the expiration of any patent rights under
the license, and may be terminated earlier upon a material breach by either
party. In 1998, we purchased all rights in TOBI owned by the Cystic Fibrosis
Foundation under a similar license for $16.0 million.

       In 1998, PathoGenesis obtained exclusive worldwide rights from Bristol-
Myers Squibb to PA-1806, a patented chemical compound in the monobactam class of
antibiotics. Those rights cover the aerosolized, non-systemic administration of
PA-1806 for the treatment or prophylaxis of respiratory tract infectious
diseases. We agreed to make initial payments totaling $4.0 million, with
subsequent payments to be made upon completion of certain milestones and a
royalty on net sales of products using this chemical compound.

       In 2000, we began collaborating with AeroGen, Inc. to develop and
register a product combining TOBI with a customized version of AeroGen's
hand-held, portable AeroDose Inhaler. Under our development and supply
agreement, we will reimburse AeroGen for costs incurred in developing the
AeroDose Inhaler and will obtain worldwide exclusive distribution rights to the
product. AeroGen will receive royalties on all product sales. PathoGenesis also
invested $2.5 million in convertible preferred stock of privately held AeroGen.
Based in Sunnyvale, California, AeroGen develops pulmonary drug delivery
products for local treatment of respiratory diseases and for input to the
systemic circulation.

       In 2000, we announced a collaboration with Chiron Corp. (Nasdaq: CHIR) to
develop new antibiotics with new mechanisms of action to better address serious
medical needs, such as concerns about drug resistance. The collaboration seeks
to combine Chiron's strong combinatorial chemistry library and expertise in
high-throughput screening with our strengths in



                                       10
<PAGE>

bacterial target discovery and antibiotic development, as well as our knowledge
of the P. aeruginosa genome.

       We engage in other research and development collaborations and licensing
arrangements with various academic institutions, government and commercial
research groups, and other companies. For example, we entered into a contract
with the Cystic Fibrosis Foundation and the University of Washington to sequence
the P. aeruginosa genome as described under "Research and Development." We
believe that none of the licenses under those other arrangements is currently
material in relation to our business as a whole. We expect to pursue additional
license agreements and research collaboration arrangements.

Patents

       PathoGenesis generally applies for patents for its proprietary compounds,
formulations or technologies. Our patent protection includes a U.S. formulation
patent on TOBI that will expire in 2013.

Government Regulation and Product Testing

       In order to conduct clinical trials and to manufacture and market
products for therapeutic use, PathoGenesis must comply with regulation by
governmental authorities in the U.S. and other countries. We also are subject to
various federal, state and local laws, regulations and recommendations,
including environmental laws and regulations.

       Before a drug may be commercially distributed in the U.S., its developer
must complete the following steps:

-         conduct preclinical laboratory and animal tests

-         submit an Investigational New Drug (IND) application that must be
          approved by the FDA before clinical trials may begin

-         conduct controlled human clinical trials to establish the safety and
          efficacy of the drug candidate

-         file a New Drug Application (NDA) with the FDA

-         comply with FDA inspection of drug manufacturing facilities to ensure
          compliance with applicable requirements

-         obtain FDA approval of the NDA prior to any commercial sale or
          shipment of the drug.

       Clinical trials involve the administration of an investigational drug
product to human subjects. In Phase I, the drug candidate is first tested in
humans for safety, side effects, dosage tolerance, metabolism and clinical
pharmacology. Phase II trials help determine efficacy, optimal dosage and
possible side effects in specific indications. Phase III trials are undertaken
to gather additional information about efficacy and safety in order to evaluate
the drug candidate's risks and benefits and to provide an adequate basis for
product labeling.

       Upon approval in the U.S., a drug may be marketed only for the approved
indications in the approved dosage forms and dosages. The FDA may require post-
marketing testing and surveillance to monitor the safety and efficacy history of
an approved product and continued compliance with regulatory requirements. The
FDA also may require an additional review of manufacturing facilities if a
material change is made to manufacturing equipment, locations or processes.

       In marketing our products outside the U.S., we must comply with the
varying regulations of international markets. Marketing authorizations generally
are approved at the national level. If a regulatory authority is satisfied that
adequate evidence of safety, quality and efficacy has been presented, marketing
authorization is usually granted. In the European Union, the mutual recognition
approval process is available to companies wishing to market a product in more
than one country in the Union. Based on TOBI's regulatory approval in the U.K.,
we are requesting that the other European Union countries approve our inhaled
drug under the mutual recognition process. Approval by the FDA and similar
health authorities does not ensure approval by other countries where TOBI is
under regulatory review.

Competition

       PathoGenesis competes with pharmaceutical companies and specialized
biotechnology firms that produce and market products in the United States,
Europe and elsewhere. Many pharmaceutical companies have focused their
development efforts in the therapeutics areas we are pursuing and may have
substantially greater financial, research and development resources. We


                                       11
<PAGE>


expect to encounter significant competition for the principal products we plan
to develop.




                                       12
<PAGE>

       The use of antibiotics to treat pseudomonal and other bacterial
infections is well-established. In cystic fibrosis patients with pseudomonal
lung infections, tobramycin is the most commonly used intravenous antibiotic.
Medical therapies for patients with CF include antibiotics, anti-inflammatory
drugs, oral replacement enzymes to maintain nutrition, physical therapy to the
chest to loosen lung secretions, and mucolytics to clear pulmonary secretions.
We believe those CF therapies complement TOBI. However, the optimal combination
may vary among patients. In addition, the potential high cost of combination
therapy may limit the use of TOBI in conjunction with other therapies. There can
be no assurance that alternative formulations of tobramycin, other antibiotics
or different approaches to therapy will not prove to be more efficacious, safer
or more cost-effective than TOBI.

Human Resources

       As of December 31, 1999, PathoGenesis had 283 employees, of which 157
were engaged in research and development and 68 in sales and marketing. A
significant number of our management and professional employees have had prior
experience with pharmaceutical, biotechnology or medical products companies.
None of our employees are covered by collective bargaining agreements. We have
entered into confidentiality agreements with all our employees.

Item 2.         Properties

       Our principal facility consists of approximately 71,000 square feet of
leased laboratory and office space in Seattle, Washington. The lease expires in
March 2003. We have subleased a portion of this space to a third party. We have
also leased about 32,000 square feet of additional office space in Seattle to
accommodate our growth as a commercial enterprise. This lease also expires in
March 2003.

       We also lease an administrative and sales and marketing office of
approximately 13,000 square feet in Skokie, Illinois. This lease expires in
March 2003. Additional leased laboratory and office space in Annandale, New
Jersey consists of approximately 37,000 square feet and houses manufacturing and
distribution support operations. The lease expires in December 2001.

       n 1998, we purchased an office building consisting of approximately 8,000
square feet in Cranford, Middlesex, England to house the operations of
PathoGenesis Limited. This wholly owned subsidiary of PathoGenesis Corporation
is leading our European expansion efforts.

Item 3.         Legal Proceedings

       On February 18, 2000, the United States District Court for the Western
District of Washington dismissed with prejudice all eight consolidated putative
class action lawsuits that had been filed in March and April 1999 against
PathoGenesis Corporation, our chief executive officer and our chief financial
officer. The eight consolidated lawsuits (Lipton v. PathoGenesis et al., C99-
0419; Green v. PathoGenesis et al., C99-0439; Gellert v. PathoGenesis et al.,
C99-0452; May v. PathoGenesis et al., C99-0453; Shapiro v. PathoGenesis et al.,
C99-0455; Bassin v. PathoGenesis et al., C99-0469; Barker v. PathoGenesis et
al., C99-0503; and Kralovk v. PathoGenesis et al., C99-0506) purported to allege
claims on behalf of all purchasers of PathoGenesis common stock during the
period January 15, 1999 to March 22, 1999. Plaintiffs had claimed that the
company and the officers violated certain provisions of the federal securities
laws by making statements in early 1999 regarding the company's 1998 financial
results. The court's order dismissed the consolidated cases and bars plaintiffs
from filing another lawsuit on the matter. Plaintiffs have appealed the
dismissal order to the United States Court of Appeals for the Ninth Circuit. We
intend to defend the appeal vigorously. Although we cannot ascertain the
ultimate outcome of the appeal at this time or predict with certainty the
results of legal proceedings, we currently believe that the resolution of the
appeal will not have a material adverse effect on our financial position or
results of operations.

Item 4.         Submission of Matters to a Vote of Security Holders

       We did not submit any matter to a vote of security holders during the
fourth quarter of 1999.




                                       13
<PAGE>



                                     PART II

Item 5.   Market for the Company's Common Stock and Related Stockholder Matters

       PathoGenesis' common stock trades on the Nasdaq National Market under the
symbol PGNS. As of March 17, 2000, there were approximately 404 holders of
record of common stock. However, we believe the actual number of beneficial
holders is substantially greater. The company has not paid any cash dividends on
the common stock to date, and currently intends to retain any earnings for the
development and growth of its business.

       The following table shows the range of high and low sales prices of the
common stock as quoted on the Nasdaq National Market for each quarter in 1999
and 1998. On March 17, 2000, the last reported sale price for the common stock
was $25.75.


<TABLE>
<CAPTION>

                                                                                      HIGH        LOW

       1999:

<S>                                                                                  <C>         <C>

           Fourth Quarter.....................................................       $23.00      $14.00
           Third Quarter......................................................        20.688      13.00
           Second Quarter.....................................................        15.875      11.125
           First Quarter......................................................        59.00       10.063

       1998:

           Fourth Quarter.....................................................        61.50       29.625
           Third Quarter......................................................        37.00       22.00
           Second Quarter.....................................................        40.375      26.313
           First Quarter......................................................        40.25       31.00


</TABLE>




                                       14
<PAGE>


Item 6.  Selected Financial Data

        In the table below, we present selected financial data for each of the
five years ended December 31, 1999, 1998, 1997, 1996 and 1995. We derived this
information from our consolidated financial statements. Please read the data
below in conjunction with the audited consolidated financial statements, related
notes and the other financial information included in this report.


<TABLE>
<CAPTION>

IN THOUSANDS, EXCEPT PER SHARE DATA                                                   YEARS ENDED DECEMBER 31,
                                                                                      ------------------------
                                                                     1999         1998          1997         1996         1995
                                                                     ----         ----          ----         ----         ----

<S>                                                                <C>          <C>             <C>          <C>          <C>

Statement of Operations Data:
Revenues:
    Sales....................................................         $60,052      $60,684         $  --        $  --        $  --
    Grants and royalties.....................................             792          368           442          440           --
                                                                     --------       ------     ---------     --------      -------

        Total revenues.......................................          60,844       61,052           442          440           --
Operating expenses:
    Cost of sales............................................          11,239        9,555            --           --           --
    Research and development.................................          30,397       28,993        28,018       20,673       15,668
    Selling, general and administrative......................          29,165       20,074        10,582        4,241        3,609
    License fee..............................................              --        4,000            --           --           --
                                                                     --------       ------     ---------     --------      -------

        Total operating expenses.............................          70,801       62,622        38,600       24,914       19,277
                                                                     --------       ------     ---------     --------      -------

        Operating loss.......................................          (9,957)      (1,570)      (38,158)     (24,474)     (19,277)
                                                                     --------       ------     ---------     --------      -------

Other income (expense):
    Investment income, net...................................           2,707        4,056         5,278        3,294        1,287
    Interest expense.........................................            (627)        (493)           --           --           --
    Other expense............................................            (318)        (110)         (158)         (84)         (34)
                                                                     --------       ------     ---------     --------      -------

        Net other income.....................................           1,762        3,453         5,120        3,210        1,253
                                                                     --------       ------     ---------     --------      -------

        Net income (loss)....................................        $ (8,195)      $1,883     $ (33,038)    $(21,264)    $(18,024)
                                                                     ========       ======     =========     ========     ========

Income (loss) per common share:
    Basic....................................................        $  (0.50)      $ 0.12     $   (2.10)    $  (1.66)     $ (2.20)
                                                                     ========       ======     =========     ========      =======
    Diluted..................................................        $  (0.50)      $ 0.11     $   (2.10)    $  (1.66)     $ (2.20)
                                                                     ========       ======     =========     ========      =======

Weighted average common shares outstanding:
    Basic....................................................          16,407       16,265        15,704       12,829        8,210
    Diluted..................................................          16,407       17,156        15,704       12,829        8,210

</TABLE>
<TABLE>
<CAPTION>


IN THOUSANDS                                                                               AT DECEMBER 31,
------------                                                                               ---------------

                                                                            1999        1998        1997          1996        1995
                                                                            ----        ----        ----          ----        ----

<S>                                                                      <C>         <C>         <C>           <C>         <C>

Cash, cash equivalents and investment securities                         $45,006     $55,007     $79,041       $60,688     $37,447
Total current assets.........................................             68,211      79,784      87,190        61,809      38,884
Total assets.................................................            100,837     112,766      97,596        69,999      46,963
Total current liabilities....................................             14,422      14,631       8,107         2,974       3,453
Long-term liability..........................................                 --       4,725          --            98         462
Total stockholders' equity...................................             86,414      93,410      89,489        66,926      43,048


</TABLE>




                                       15
<PAGE>


Item 7.   Management's Discussion and Analysis of Financial Condition and
          Results of Operations

       In reading the discussion below, you should keep in mind that it contains
forward-looking statements involving risks and uncertainties that affect our
future operating results. Those factors include, but are not limited to,
uncertainties related to the fact that PathoGenesis only began commercial
operations in 1998, its dependence on TOBI, the degree of penetration of its
markets and frequency of TOBI's use by patients, risks associated with marketing
TOBI in international markets, third party reimbursement and product pricing,
seasonal impacts on hospitalizations or exacerbations experienced by patients,
variability in wholesaler ordering patterns, drug development and clinical
trials, uncertain outcome of the U.S. and international drug approval process,
competition and alternative therapies. A discussion of some of those factors is
included in Exhibit 99.1 of this report.

Results of Operations

       Years Ended December 31, 1999 and 1998

       Revenues. Revenues in 1999 totaled $60.8 million, including $60.1 million
from TOBI sales. Research grants and royalties generated the balance of
$792,000. Revenues for 1998 were $61.1 million, including $60.7 million from
TOBI sales in the first year of the drug's launch. Research grants and royalties
generated the balance of $368,000 in 1998. Because we launched TOBI in 1998,
sales in that year benefited from initial purchases of stock to fill the
distribution chain. In addition, our 1999 and 1998 sales were affected by
quarterly fluctuations in ordering patterns for TOBI. Quarterly TOBI sales
volume is influenced by a number of factors, including underlying demand and
wholesaler inventory management practices.

       Operating Expenses. We incurred total operating expenses of $70.8 million
in 1999, an increase of $8.2 million from $62.6 million in 1997. Cost of sales
was $11.2 million in 1999, an increase of $1.7 million from $9.6 million in
1998. This increase in the cost of sales is the result of a reduction in the
number of manufacturing batches in 1999, leading to a higher portion of
manufacturing costs being charged directly to cost of sales. Research and
development expense for 1999 increased by $1.4 million to $30.4 million from
$29.0 million in 1998. Selling, general and administrative expenses increased to
$29.2 million in 1999 from $20.1 million in 1998 due mainly to increased sales
and marketing costs. In 1999, we increased our U.S. sales force 30%. We also
expanded our advisory board of respected cystic fibrosis physicians, who are
assisting us in communicating the extensive data now available on TOBI. We also
made significant strides in expanding the international market for TOBI. In 1999
and early 2000, we received regulatory approvals to market TOBI in Canada,
Argentina, Israel, Australia and the United Kingdom. General and administrative
expenses also rose due to staff-related and consulting costs.

       Net Income (Loss). We had an operating loss of $10.0 million in 1999, an
increase of $8.4 million from the operating loss of $1.6 million in 1998. This
increased loss was due to higher operating expenses in 1999, primarily relating
to sales and marketing costs. Including net other income (primarily income from
investment securities), our net loss for 1999 was $8.2 million, compared to net
income of $1.9 million in 1998. In 1999, net investment income decreased by $1.4
million to $2.7 million from $4.1 million in 1998. The decrease was primarily
due to lower average invested cash balances. Interest expense, most of which
represents the amortization of the discount on the remaining installments of our
obligation to the Cystic Fibrosis Foundation, totaled $627,000 and $493,000 in
1999 and 1998, respectively.

       Years Ended December 31, 1998 and 1997

       Revenues. Revenues in 1998 totaled $61.1 million, including $60.7 million
from TOBI sales in the first year of the drug's launch. Research grants and
royalties generated the balance of $368,000. Revenues for 1997 were $442,000,
which were entirely generated by research grants and royalties.

       Operating Expenses. We incurred total operating expenses of $62.6 million
in 1998, an increase of $24.0 million from $38.6 million in 1997. The costs of
manufacturing and marketing TOBI accounted for the majority of the increase. A
$4.0 million license fee to Bristol-Myers Squibb for PA-1806, a novel, patented
drug candidate being developed as an inhaled antibiotic, also represented a
significant portion of the increase. Cost of sales was $9.6 million in 1998. We
did not incur such costs in 1997 because sales did not begin until 1998. Our
research and development expense for 1998 increased by $1.0 million to $29.0
million from $28.0 million in 1997. These costs rose as we continued to develop
new drug candidates and pursue regulatory approval of TOBI in Canada, Europe and
other markets. Selling, general and administrative expenses increased to $20.1
million in 1998 from $10.6 million in 1997. The increase primarily reflects the
costs associated with supporting our U.S. sales and marketing effort, adding
administrative staff and developing a sales and marketing program in Europe.



                                       16
<PAGE>


       Net Income (Loss). We had an operating loss of $1.6 million in 1998, a
decrease of $36.6 million from the operating loss of $38.2 million in 1997. This
decline in operating loss was due to TOBI sales revenues in 1998. Including net
other income (primarily income from investment securities), our net income for
1998 was $1.9 million, compared to a net loss of $33.0 million in 1997. In 1998,
net investment income decreased by $1.2 million to $4.1 million from $5.3
million in 1997. The decrease was primarily due to lower average invested cash
balances. Interest expense in 1998 totaled $493,000. We had no interest expense
in 1997.

Liquidity and Capital Resources

       Our combined cash, cash equivalents and investment securities totaled
$45.0 million at December 31, 1999, a decrease of $10.0 million from the balance
of $55.0 million at December 31, 1998. We expect that these funds, in
combination with expected revenues from sales of TOBI, should be sufficient to
meet our operating expenses and capital requirements for the foreseeable future.
In addition, we obtained a $10.0 million revolving line of credit in 1999 from
Harris Trust and Savings Bank.

       Net cash used in operating activities totaled $1.2 million for 1999,
compared to $9.6 million in 1998. We incurred an $8.2 million net loss for 1999,
compared to net income of $1.9 million for 1998. Significant changes in working
capital components included a $4.9 million decrease in accounts receivable and
$4.7 million increase in inventory, compared to increases of $11.0 million and
$5.0 million, respectively, in 1998. Also, license payable decreased by $2.0
million in 1999 as we paid the second half of our initial obligation to Bristol-
Myers Squibb. In addition, during 1999 we purchased $4.4 million in property and
equipment and made our second installment payment of $5.3 million for the rights
in TOBI acquired from the Cystic Fibrosis Foundation. At December 31, 1999, our
working capital was $53.8 million and current ratio was 4.73 to 1.

       In 2000, we expect net cash flow from operations to be about break-even.
We expect to incur capital expenditures of approximately $4.0 million to $6.0
million. In March 2000, we invested $2.5 million in convertible preferred stock
of privately held AeroGen, Inc. In addition, the final installment payment of
$5.3 million to the Cystic Fibrosis Foundation will be due in May 2000. This
cash flow projection does not include the effects of any licensing or
collaboration agreements which we may enter into in 2000.

       We plan to continue our policy of investing excess funds in government
securities and investment grade, interest-bearing securities, primarily those
with an expected maturity of one-and-one-half years or less. We do not invest in
derivative financial instruments, as defined by Statement of Financial
Accounting Standards (SFAS) No. 119, Disclosure About Derivative Financial
Instruments and Fair Value of Financial Instruments.

       At December 31, 1999, we had tax net operating loss carryforwards of
approximately $100.6 million and research and experimentation tax credit
carryforwards of approximately $1.5 million, both of which will begin to expire
in 2007. We also have orphan drug credits of approximately $5.0 million, which
will expire beginning in 2007.

Outlook

       We expect sales of TOBI to increase in 2000, as we further penetrate the
U.S. cystic fibrosis market, gain approvals for TOBI in international markets
and expand TOBI's use in other patients with serious lung infections. We expect
cost of sales as a percentage of sales to decline slightly in 2000 as sales
volumes increase. We expect our sales and marketing costs to continue increasing
at a rate comparable to prior years as we expand U.S. sales and open new markets
in Europe and elsewhere. Having received marketing approval for TOBI in the
U.K., we are seeking approval for TOBI from the other European Union countries
through a mutual recognition process. We are marketing TOBI using our own sales
force in the U.K. and Canada. We intend to market TOBI ourselves in several
other countries, while working through distributors elsewhere. To date, we have
secured agreements with specialized local distributors in Argentina, Australia,
Cyprus, Germany, Greece, Israel, Italy and the Nordic countries.

       Research and development costs are expected to increase in 2000 as we
invest in a number of new development initiatives. For example, we intend to
conduct or co-sponsor a number of Phase IV clinical trials of TOBI in cystic
fibrosis, bronchiectasis, ventilator-associated pneumonia and lung transplant
patients. In addition, we currently plan to begin Phase I clinical trials of PA-
1806 later in 2000.




                                       17
<PAGE>


       We have begun a program to develop a more convenient version of TOBI. Our
goal is to reduce TOBI's delivery time from 15-20 minutes to 5-10 minutes or
less. Drug delivery companies are developing new generations of nebulizers and
dry powder delivery devices that were not available when TOBI was formulated in
1994. These devices are hand-held, portable and do not require the use of an
electrically powered air compressor. In March 2000, we entered into an agreement
with AeroGen, Inc. to collaborate on the development and registration of a
product combining TOBI and AeroGen's hand-held, portable AeroDose(TM) Inhaler.
Under the development and supply agreement, we will reimburse AeroGen for costs
incurred in developing the AeroDose Inhaler and will obtain worldwide exclusive
distribution rights to the product. AeroGen will receive royalties on all
product sales.

       We also intend to select and initiate development of at least one other
antibiotic for inhalation to address broader respiratory infection markets, as a
result of our own research programs and collaborations with others. In January
2000, we announced a research collaboration with Chiron Corp., with the goal of
identifying new classes of antibiotics for oral, intravenous and inhaled
administration that could address the increasingly important issue of drug
resistance. The collaboration seeks to combine Chiron's strong combinatorial
chemistry library and expertise in high-throughput screening with our strengths
in bacterial target discovery and antibiotic development, as well as our
knowledge of the P. aeruginosa genome (genetic structure).

Year 2000

       We completed our year 2000 compliance program in late 1999, which
included verification testing of our internal information technology and
information systems. In addition, we contacted key third parties, such as
suppliers, customers and financial institutions, to assure no interruption of
our business relationships would occur due to year 2000 compliance issues. Our
existing systems that were not year 2000-compliant represented a small
percentage of our systems, and almost all noncompliant systems were replaced as
part of normal technology upgrades in 1999. The remaining systems were evaluated
on an individual basis, and upgraded or replaced as necessary. Our total year
2000 compliance costs were approximately $50,000 in 1999, excluding the costs of
technology upgrades made in the ordinary course of business.

       Our systems successfully transitioned to the year 2000, and to date we
have not experienced any significant problems associated with year 2000 issues.
However, there may be latent problems that surface at certain dates or events in
the future. We will continue to monitor our systems and those of key third
parties throughout the year 2000 to ensure that any latent problems are
addressed promptly.

Item 7A.  Quantitative and Qualitative Disclosures about Market Risk

       We are exposed to the impact of interest rate changes and changes in the
market values of our investments, in addition to changes in foreign currency
exchange rates.

Interest Rate Risk

       Our exposure to market rate risk for changes in interest rates relates
primarily to debt securities included in our investment portfolio. We do not
hold any derivative financial instruments. We invest in government securities
and high-quality corporate obligations. Investments in both fixed rate and
floating rate interest-earning instruments carry a degree of interest rate risk.
Fixed rate securities may have their fair market value adversely impacted due to
a rise in prevailing interest rates, while floating rate securities may produce
less income than expected if prevailing interest rates fall. Due in part to
these factors, our future investment income may fall short of expectations due
to changes in interest rates, or we may suffer losses in principal if forced to
sell securities which have declined in market value due to changes in interest
rates. At December 31, 1999, we owned $3.7 million in government debt
instruments and $30.8 million in corporate debt securities. Our exposure to
losses as a result of interest rate changes is managed through investing in
securities predominantly with maturities of one-and-one-half years or less.

Foreign Currency Risk

       Substantially all the revenue and operating expenses of our subsidiaries
are denominated in local currencies and translated into U.S. dollars at rates of
exchange approximating those existing at the date of the transactions. Foreign
currency translation primarily impacts revenue and operating expenses as a
result of exchange rate fluctuations. Because our inventories are manufactured
in the U.S., foreign currency fluctuations generally do not affect our cost of
sales. Our foreign currency transaction risk is primarily limited to amounts
receivable from our subsidiaries and distributors, which are denominated in
local currencies. We do not currently utilize foreign currency hedging
contracts. If the U.S. dollar uniformly increases in strength by 10% in 2000
relative to the currencies in which our sales are denominated, income before
taxes would not be significantly impacted.




                                       18
<PAGE>


Item 8.         Consolidated Financial Statements

        The consolidated financial statements for the fiscal year ended December
31, 1999 appear beginning on page F-1 of this annual report on Form 10-K.

Item 9.   Changes in and Disagreements with Accountants on Accounting and
          Financial Disclosure

        None.




                                       19
<PAGE>


                                    PART III

Item 10.  Directors and Executive Officers of Registrant

       The information appearing under the captions "Election of Directors,"
"Executive Officers" and "Security Ownership of Certain Beneficial Owners and
Management - Did directors and executive officers comply with Section 16(a)
beneficial ownership report requirements in 1999?" in the proxy statement for
the annual meeting of stockholders to be held on May 31, 2000, is incorporated
in this report by reference.

Item 11.  Executive Compensation

       Information appearing under the caption "Executive Compensation" in the
proxy statement for the 2000 annual meeting is incorporated in this report by
reference.

Item 12.  Security Ownership of Certain Beneficial Owners and Management

       The information included under the caption "Security Ownership of Certain
Beneficial Owners and Management" in the proxy statement for the 2000 annual
meeting is incorporated in this report by reference.

Item 13.  Certain Relationships and Related Transactions

       None.




                                       20
<PAGE>


                                     PART IV

Item 14.  Exhibits, Financial Statement Schedules, and Reports on Form 8-K

(a)    Documents Filed As a Part of This Report

       (1)    Financial Statements. PathoGenesis' consolidated balance sheets as
              of December 31, 1999 and 1998, and the related consolidated
              statements of operations, stockholders' equity and cash flows for
              each of the years in the three-year period ended December 31,
              1999, together with the report of its Independent Auditors, appear
              beginning on page F-1.

       (2)    Financial Statement Schedule. The following schedule supporting
              the foregoing consolidated financial statements for the years
              ended December 31, 1999 and 1998, is filed as part of this Form
              10-K.

              Schedule II. Valuation and Qualifying Accounts - page 22

              Report of Independent Auditors on Schedule - page 23

              All other schedules are omitted because they are not applicable,
              not required, or because the required information is included in
              the consolidated financial statements or notes thereto.

       (3)    Exhibits. The exhibits to this report are listed in the Exhibit
              Index included at the end of this report. Included in the exhibits
              listed in the Index are the following exhibits which constitute
              management contracts or compensatory plans or arrangements:

              10.3      Employment Agreement between the Company and A. Bruce
                        Montgomery, dated September 19, 1995

              10.4      Employment Agreement between the Company and Marc F.
                        Wipperman, effective as of July 1, 1996

              10.26     1992 Stock Option Plan

              10.27     1996 Non-Employee Director Plan

              10.28     1997 Stock Option Plan and related Form of Stock Option
                        Agreement

              10.32     Form of Change in Control Employment Agreement for
                        certain key employees

              10.34     1999 Employee Stock Option Plan and related Form of
                        Stock Option Agreement

              10.35     1999 Stock Plan and related Form of Stock Option
                        Agreement

              10.36     Employee Stock Purchase Plan

              10.37     401(k) Profit Sharing Plan and related Trust Agreement

(b)    Reports on Form 8-K

       PathoGenesis filed a report on Form 8-K on December 15, 1999, upon
receiving regulatory approval to market TOBI in the U.K.

(c)    Exhibits

       The exhibits to this report are listed in the Exhibit Index which appears
after the signature page of this report and is hereby incorporated by reference.



                                       21
<PAGE>


                                   SCHEDULE II

                        Valuation and Qualifying Accounts
                     Years Ended December 31, 1999 and 1998

<TABLE>
<CAPTION>

                                                           BALANCE AT                                               BALANCE
                                                           BEGINNING                                                 AT END
                                                            OF YEAR           ADDITIONS         DEDUCTIONS          OF YEAR
                                                            -------           ---------         ----------          -------

<S>                                                        <C>                <C>               <C>                 <C>

Year ended December 31, 1998

Allowances for discounts, returns, bad debts,              $       --         $3,554,436        $2,003,572          $1,550,864
   chargebacks and rebates

Year ended December 31, 1999

Allowances for discounts, returns, bad debts,              $1,550,864         $6,098,929        $4,462,420          $3,187,373
   chargebacks and rebates


</TABLE>





                                       22
<PAGE>


                    INDEPENDENT AUDITORS' REPORT ON SCHEDULE

The Board of Directors and Stockholders PathoGenesis Corporation:

Under the date of January 21, 2000 except as to note 12, which is as of March
23, 2000, we reported on the consolidated balance sheets of PathoGenesis
Corporation and subsidiaries as of December 31, 1999 and 1998, and the related
consolidated statements of operations, stockholders' equity, and cash flows for
each of the years in the three-year period ended December 31, 1999, as contained
in the 1999 Annual Report on Form 10-K. In connection with our audits of the
aforementioned consolidated financial statements, we also audited the related
consolidated financial statement schedule of valuation and qualifying accounts
for the years ended December 31, 1999 and 1998 contained in the 1999 Annual
Report on Form 10-K. This financial statement schedule is the responsibility of
the Company's management. Our responsibility is to express an opinion on this
financial statement schedule based on our audits.

In our opinion, such financial statement schedule, when considered in relation
to the basic consolidated financial statements taken as a whole, presents
fairly, in all material respects, the information set forth therein.

                                    KPMG LLP

Seattle, Washington
January 21, 2000



                                       23
<PAGE>


                            PATHOGENESIS CORPORATION

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS


<TABLE>
<CAPTION>
                                                                                                                         PAGE NO.
                                                                                                                         --------

<S>                                                                                                                 <C>

Independent Auditors' Report.....................................................................................          F-2
Consolidated Balance Sheets as of December 31, 1999 and 1998.....................................................          F-3
Consolidated Statements of Operations for the Years Ended December 31, 1999, 1998 and 1997.......................          F-4
Consolidated Statements of Stockholders' Equity for the Years Ended December 31, 1999, 1998 and 1997.............          F-5
Consolidated Statements of Cash Flows for the Years Ended December 31, 1999, 1998 and 1997.......................          F-6
Notes to Consolidated Financial Statements.......................................................................          F-7



</TABLE>












                                       F-1
<PAGE>




                          INDEPENDENT AUDITORS' REPORT

The Board of Directors and Stockholders PathoGenesis Corporation:

We have audited the accompanying consolidated balance sheets of PathoGenesis
Corporation and subsidiaries (Company) as of December 31, 1999 and 1998, and the
related consolidated statements of operations, stockholders' equity and cash
flows for each of the years in the three-year period ended December 31, 1999.
These consolidated financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these consolidated
financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the financial position of PathoGenesis
Corporation and subsidiaries as of December 31, 1999 and 1998, and the results
of their operations and their cash flows for each of the years in the three-year
period ended December 31, 1999, in conformity with generally accepted accounting
principles.

                                    KPMG LLP

Seattle, Washington
January 21, 2000,
except as to note 12, which is as of March 23, 2000


                                      F-2
<PAGE>


                            PATHOGENESIS CORPORATION

                                AND SUBSIDIARIES

                           Consolidated Balance Sheets


<TABLE>
<CAPTION>
                                                                                                          DECEMBER 31,
                                                                                                          ------------
                                           Assets                                                    1999               1998
                                                                                                     ----               ----

<S>                                                                                                <C>                <C>

Current assets:
       Cash and cash equivalents                                                                    $ 10,456,031      $  8,139,153
       Investment securities                                                                          34,549,738        46,868,390
       Accounts receivable, net                                                                        6,038,299        10,961,242
       Interest receivable                                                                               442,676           427,618
       Inventories                                                                                    14,613,385         9,907,916
       Other current assets                                                                            2,110,610         3,480,022
                                                                                                    ------------      ------------
           Total current assets                                                                       68,210,739        79,784,341
                                                                                                    ------------      ------------

Restricted investment                                                                                         --           675,000

Property and equipment, at cost:
       Land                                                                                            3,030,938         3,194,923
       Building and improvements                                                                       1,454,850         1,515,543
       Leasehold improvements                                                                          9,735,242         9,367,898
       Furniture and equipment                                                                        16,948,235        13,263,162
                                                                                                    ------------      ------------

                                                                                                      31,169,265        27,341,526
       Less accumulated depreciation and amortization                                                 12,957,926         9,704,385
                                                                                                    ------------      ------------
           Net property and equipment                                                                 18,211,339        17,637,141
                                                                                                    ------------      ------------
License rights, net                                                                                   13,591,321        14,562,129

Other assets                                                                                             823,519           107,136
                                                                                                    ------------      ------------
                                                                                                    $100,836,918      $112,765,747
                                                                                                    ============      ============
                            Liabilities and Stockholders' Equity

Current liabilities:

       Accounts payable                                                                             $  1,668,775      $  1,180,909
       Compensation and benefits                                                                       2,524,184         2,580,790
       Clinical development costs                                                                      1,391,383           199,869
       Accrued royalties                                                                                 906,629           827,739
       License payable                                                                                        --         2,000,000
       Other accrued expenses                                                                          2,781,644         2,691,572
       Current portion of long-term liability                                                          5,149,847         5,149,847
                                                                                                    ------------      ------------
       Total current liabilities                                                                      14,422,462        14,630,726
                                                                                                    ------------      ------------

Long-term liability, net of current portion                                                                   --         4,724,630

Commitments and subsequent events

Stockholders' equity:
       Preferred stock, $0.01 par value. Authorized 1,000,000 shares; none issued and
        outstanding                                                                                           --                --
    Common stock, $0.001 par value. Authorized 60,000,000 shares; 16,451,530 shares and
        16,328,580 shares issued and outstanding at December 31, 1999 and 1998, respectively              16,452            16,329
Additional paid-in capital                                                                           194,641,919       193,188,363
Deferred compensation                                                                                   (526,199)         (987,156)
Accumulated other comprehensive income (loss)                                                           (582,036)          133,117
Accumulated deficit                                                                                 (107,135,680)      (98,940,262)
                                                                                                    ------------      ------------
Total stockholders' equity                                                                            86,414,456        93,410,391
                                                                                                    ------------      ------------
                                                                                                    $100,836,918      $112,765,747
                                                                                                    ============      ============
</TABLE>

          See accompanying notes to consolidated financial statements.


                                      F-3
<PAGE>


                            PATHOGENESIS CORPORATION

                                AND SUBSIDIARIES

                      Consolidated Statements of Operations

<TABLE>
<CAPTION>

                                                                                            YEARS ENDED DECEMBER 31,
                                                                                            ------------------------
                                                                                     1999             1998              1997
                                                                                     ----             ----              ----

<S>                                                                                 <C>             <C>             <C>

Revenues:
     Sales                                                                         $ 60,052,486     $ 60,684,091   $         --
     Grants and royalties                                                               791,739          367,673        441,880
                                                                                   ------------     ------------   ------------
          Total revenues                                                             60,844,225       61,051,764        441,880
                                                                                   ------------     ------------   ------------

Operating expenses:
     Cost of sales                                                                   11,239,170        9,555,213             --
     Research and development                                                        30,397,456        28,992,71     28,017,738
     Selling, general and administrative                                             29,164,673       20,073,736     10,582,072
     License fee                                                                             --        4,000,000             --
                                                                                   ------------     ------------   ------------

     Total operating expenses                                                        70,801,299       62,621,663     38,599,810
                                                                                   ------------     ------------   ------------
          Operating loss                                                             (9,957,074)      (1,569,899)   (38,157,930)
                                                                                   ------------     ------------   ------------

Other income (expense):
     Investment income, net                                                           2,706,739        4,055,821      5,278,098
     Interest expense                                                                  (626,727)        (492,551)            --
     Other expense                                                                     (318,356)        (110,470)      (157,898)
                                                                                   ------------     ------------   ------------
          Net other income                                                            1,761,656        3,452,800      5,120,200
                                                                                   ------------     ------------   ------------
          Net income (loss)                                                        $ (8,195,418)    $  1,882,901   $(33,037,730)
                                                                                   ============     ============   ============

Income (loss) per common share:
     Basic                                                                         $      (0.50)    $       0.12   $      (2.10)
                                                                                   ============     ============   ============
     Diluted                                                                       $      (0.50)    $       0.11   $      (2.10)
                                                                                   ============     ============   ============

Weighted average common shares outstanding:
     Basic                                                                           16,406,734       16,265,452     15,704,151
     Diluted                                                                         16,406,734       17,155,691     15,704,151

</TABLE>

          See accompanying notes to consolidated financial statements.

                                      F-4
<PAGE>


                            PATHOGENESIS CORPORATION

                                AND SUBSIDIARIES

                 Consolidated Statements of Stockholders' Equity

<TABLE>
<CAPTION>

                                 NUMBER OF                                             ACCUMULATED
                                   COMMON                 ADDITIONAL                      OTHER                         TOTAL
                                   SHARES      COMMON      PAID-IN       DEFERRED     COMPREHENSIVE    ACCUMULATED   STOCKHOLDERS'
         DESCRIPTION            OUTSTANDING     STOCK      CAPITAL     COMPENSATION   INCOME (LOSS)      DEFICIT        EQUITY
                                -----------     -----      -------     ------------   -------------      -------        ------

<S>                            <C>           <C>      <C>              <C>           <C>             <C>            <C>

Balances at December 31, 1996    13,930,760   $13,931  $134,727,920    $         --        $(30,204)  $(67,785,433)  $ 66,926,214


Shares issued for cash, net       2,100,000     2,100    53,151,262              --              --             --     53,153,362
   of issue costs of
   $3,546,639
 Exercise of options and
  warrants                          207,889       208     2,140,248              --              --             --      2,140,456
Deferred compensation from
granting of stock options                --        --     1,594,024      (1,594,024)             --             --             --
Compensation expense from
stock options                            --        --            --         298,879              --             --         298,879
Comprehensive loss                       --        --            --              --              --             --             --
Net loss                                 --        --            --              --              --    (33,037,730)   (33,037,730)
Unrealized gain on investment
securities                               --        --            --              --           7,569             --          7,569
                                                                                                                     ------------
Total comprehensive loss                 --        --            --              --              --             --    (33,030,161)
                                 ----------   -------  ------------      ----------        --------  -------------   ------------
Balances at December 31, 1997    16,238,649    16,239   191,613,454      (1,295,145)        (22,635)  (100,823,163)    89,488,750

Exercise of stock options            89,931        90     1,373,827              --              --             --      1,373,917
Deferred compensation from
granting of stock options                --        --       201,082        (201,082)             --             --             --
Compensation expense
from stock options                       --        --            --         509,071              --             --        509,071
Comprehensive income                     --        --            --              --              --             --             --
Net income                               --        --            --              --              --      1,882,901      1,882,901
Unrealized gain on
investment securities                    --        --            --              --         155,752             --        155,752
Total comprehensive income               --        --            --              --              --             --      2,038,653
                                 ----------   -------  ------------      ----------        --------  -------------   ------------
Balances at December 31, 1998    16,328,580    16,329   193,188,363        (987,156)        133,117    (98,940,262)    93,410,391

Exercise of stock options
and warrants                         59,889        60       541,594              --              --             --        541,654
Shares purchased through
employee stock purchase plan         63,061        63       911,962              --              --             --        912,025
Compensation expense
from stock options                       --        --            --         460,957              --             --        460,957
Comprehensive loss
Net loss                                 --        --            --              --              --     (8,195,418)    (8,195,418)
Foreign currency translation
adjustments                              --        --            --              --        (287,183)            --       (287,183)
Unrealized loss on investment
securities                               --        --            --              --        (427,970)            --       (427,970)
Total comprehensive loss                 --        --            --              --              --             --     (8,910,571)
                                 ----------   -------  ------------      ----------        --------  -------------   ------------
Balances at December 31, 1999    16,451,530   $16,452  $194,641,919      $ (526,199)      $(582,036) $(107,135,680)   $86,414,456
                                 ==========   =======  ============      ==========       =========  =============   ============

</TABLE>


          See accompanying notes to consolidated financial statements.

                                      F-5
<PAGE>


                            PATHOGENESIS CORPORATION

                                AND SUBSIDIARIES

                      Consolidated Statements of Cash Flows

<TABLE>
<CAPTION>

                                                                                              YEARS ENDED DECEMBER 31,
                                                                                              ------------------------
                                                                                        1999             1998            1997
                                                                                        ----             ----            ----

<S>                                                                                  <C>               <C>          <C>

Cash flows from operating activities:
    Net income (loss)                                                                 $ (8,195,418)    $ 1,882,901   $ (33,037,730)
    Adjustments to reconcile net income (loss) to net cash used in operating
     activities:
     Depreciation and amortization                                                       3,468,865       2,566,335       2,076,900
     Amortization of license rights                                                        970,808         153,131              --
     Amortization of discount on long-term liability                                       608,703         492,551              --
     Compensation expense from stock options                                               460,957         509,071         298,879
     Loss on sale of property and equipment                                                 16,975              --          42,643
     Changes in certain assets and liabilities:
        Accounts receivable                                                              4,922,943     (10,961,242)              --
        Interest receivable                                                                (15,058)        228,778        (357,959)
        Inventories                                                                     (4,705,492)     (4,972,158)     (4,935,758)
        Other current assets                                                             1,352,705        (923,613)     (1,733,317)
        Other assets                                                                        54,403          15,053         (21,819)
        Accounts payable                                                                   503,177          12,044         356,606
        Compensation and benefits                                                          (56,606)      1,119,623         686,909
        Clinical development costs                                                       1,190,489      (2,685,238)      2,066,478
        Accrued royalties                                                                   78,890         827,739              --
        License payable                                                                 (2,000,000)      2,000,000              --
        Other accrued expenses                                                             104,190          99,912       2,022,592
        Other                                                                                   --              --         (65,191)
                                                                                      ------------     -----------      ----------
        Net cash used in operating activities                                           (1,239,469)     (9,635,113)    (32,600,767)
                                                                                      ------------     -----------      ----------

Cash flows from investing activities:
    Purchases of investment securities                                                 (31,702,730)    (47,736,796)   (177,646,664)
    Sales of investment securities                                                      44,268,412      74,893,699     149,653,588
    Purchases of property and equipment                                                 (4,385,659)    (10,594,811)     (4,370,202)
    Proceeds from sale of property and equipment                                            73,755              --          56,000
    Purchases of other assets                                                             (810,893)             --              --
    Purchase of license rights                                                                  --      (5,333,334)             --
                                                                                       ------------    -----------      ----------
        Net cash provided by (used in) investing activities                              7,442,885      11,228,758     (32,307,278)
                                                                                       ------------    -----------      ----------

Cash flows from financing activities:
    Net proceeds from issuance of common stock                                                  --              --      53,153,362
    Proceeds from issuance of common stock in connection with employee stock               912,025              --              --
    purchase plan
    Stock option and warrant exercises                                                     541,654       1,373,917       2,140,456
    Payment of long-term liability                                                      (5,333,333)             --              --
                                                                                       ------------    -----------      ----------
        Net cash provided by (used in) financing activities                             (3,879,654)      1,373,917      55,293,818
                                                                                       ------------    -----------      ----------
Effect of exchange rate changes on cash                                                     (6,884)             --              --
                                                                                       ------------    -----------      ----------
        Net increase (decrease) in cash and cash equivalents                             2,316,878       2,967,562      (9,614,227)

Cash and cash equivalents at beginning of year                                           8,139,153       5,171,591      14,785,818
                                                                                       ------------    -----------      ----------
Cash and cash equivalents at end of year                                               $10,456,031     $ 8,139,153      $5,171,591
                                                                                      ============     ===========      ==========

Supplemental schedule of noncash investing and financing activities -
Seller-financed                                                                            $    --     $ 9,381,926      $       --
    acquisition of license rights

</TABLE>


          See accompanying notes to consolidated financial statements.

                                      F-6
<PAGE>


                            PATHOGENESIS CORPORATION

                                AND SUBSIDIARIES

     Notes to Consolidated Financial Statements, December 31, 1999 and 1998

(1)    Organization and Summary of Significant Accounting Policies

       Business

       PathoGenesis Corporation is a pharmaceutical company that develops and
       commercializes drugs to treat chronic infectious diseases where there is
       a significant need for improved therapy. We market TOBI(R) (tobramycin
       solution for inhalation), an inhaled antibiotic, for management of P.
       aeruginosa lung infections in patients with cystic fibrosis. In addition,
       PathoGenesis is developing other drug candidates to treat serious chronic
       lung infections, including those common in cystic fibrosis,
       bronchiectasis and ventilator patients.

       Concentrations of Risk

       Substantially all our revenue is currently generated through sales of
       TOBI. Our other drug candidates are not expected to be commercially
       available for at least several years, if at all. Therefore, a significant
       change in demand or pricing for TOBI, or the introduction of a competing
       product, are among the factors that could have a material impact on our
       operations.

       PathoGenesis uses wholesale distributors of pharmaceutical products as
       the principal means of distributing TOBI to clinics, hospitals and
       pharmacies. For 1999 and 1998, sales to our three largest wholesale
       distributors were 64% and 65% of total sales, respectively. Accounts
       receivable from these distributors were 44% and 63% of total accounts
       receivable at December 31, 1999 and 1998, respectively.

       We purchase our primary basic raw material, bulk powdered tobramycin,
       from two of the principal worldwide suppliers of the drug. We anticipate
       that either one of these suppliers alone will be able to supply
       sufficient quantities to meet current needs. However, there can be no
       assurance that these suppliers will be able to meet future demand in a
       timely and cost- effective manner. Our operations could be adversely
       affected by an interruption or reduction in the supply of raw material.

       PathoGenesis has entered into contracts with third parties for the
       production and packaging of TOBI. Our reliance on external sources of
       production and packaging can be shifted, over time, to alternative
       sources should such changes be necessary. However, if the contract
       manufacturers become unable to produce or package sufficient quantities
       of TOBI due to work stoppages or other factors beyond our control, our
       operations could be disrupted until alternative sources are secured.

       Basis of Presentation

       The accompanying consolidated financial statements include the accounts
       of the company and its wholly owned subsidiaries, PathoGenesis Limited
       and PathoGenesis Canada Limited. All significant intercompany accounts
       and transactions have been eliminated in consolidation.

       Cash Equivalents

       All investments in debt instruments with a contractual maturity of three
       months or less at the date of purchase are considered to be cash
       equivalents. Cash equivalents totaled $1,900,000 at December 31, 1999.
       There were no cash equivalents at December 31, 1998.

       Investment Securities

       Our investment securities are classified as available-for-sale and
       carried at market value, with unrealized gains and losses excluded from
       the consolidated statements of operations and reported in other
       comprehensive income (loss). Realized gains and losses on the sales of
       investment securities are determined on the specific identification
       method and included in investment income, net.


                                      F-7
<PAGE>


       Investment in Affiliate

       In 1999, we acquired approximately 20% of the issued share capital of
       PulmoPharm GmbH, a distributor of pharmaceutical products in Germany.
       This investment is included in other assets and is accounted for using
       the equity method. Accordingly, the investment is recorded at cost,
       adjusted for our share of income or losses of the entity.

       Inventories

       Inventories are stated at the lower of cost, as determined by the
       first-in, first-out method, or market.

       Depreciation and Amortization

       Improvements, furniture and equipment are depreciated using the straight-
       line method over the assets' estimated useful lives of 5 to 10 years.
       Leasehold improvements are amortized using the straight-line method over
       the shorter of the assets' estimated useful lives or the remaining term
       of the lease. Our building in England is depreciated using the
       straight-line method over its estimated useful life of 40 years.

       Revenues

       Product sales are recognized upon shipment. We perform ongoing credit
       evaluations of our customers and generally do not require collateral.
       Product sales are recorded net of reserves for estimated chargebacks,
       returns, discounts and rebates. Allowances for discounts, returns, bad
       debts, chargebacks and rebates, which are netted against accounts
       receivable, totaled $3,187,373 and $1,550,864 at December 31, 1999 and
       1998, respectively.

       In December 1999, the Securities and Exchange Commission released Staff
       Accounting Bulletin (SAB) No. 101, Revenue Recognition in Financial
       Statements, which must be applied in the first quarter of 2000. SAB No.
       101 provides guidance on revenue recognition issues. We do not expect
       that the adoption of SAB No. 101 will have a current impact on our
       financial statements.

       Translation of Foreign Currencies

       The financial statements of our subsidiaries are translated from local
       currency into U.S. dollars using the current exchange rate at the balance
       sheet date for assets and liabilities, and the average exchange rate
       prevailing during the period for revenues and expenses. The local
       currency is considered to be the functional currency for each entity and
       accordingly, translation adjustments for these subsidiaries are included
       as a component of accumulated other comprehensive income or loss in
       stockholders' equity. Transaction gains and losses are recorded in other
       income (expense) and were insignificant in 1999 and 1998.

       Research and Development Costs

       Research and development costs are charged to expense as incurred.

       Income Taxes

       Deferred income taxes are provided based on the estimated future tax
       effects of temporary differences between financial statement carrying
       amounts of existing assets and liabilities and their respective tax bases
       and for net operating loss and tax credit carryforwards.

       Deferred tax assets and liabilities are measured using enacted tax rates
       that are expected to apply to taxable income in the years in which those
       temporary differences and carryforwards are expected to be recovered or
       settled. The effect on deferred tax assets and liabilities of a change in
       tax rates is recognized in income in the period that includes the
       enactment date. A valuation allowance is established when necessary to
       reduce deferred tax assets to the amount expected to be realized.

       Fair Value of Financial Instruments

       Our financial instruments other than investments consist of cash and cash
       equivalents, accounts receivable, interest receivable, accounts payable
       and a contract payable. The fair value of these financial instruments
       approximates their


                                      F-8
<PAGE>


       carrying amount due to their short-term nature or current market
       indicators.

       Comprehensive Income (Loss)

       Comprehensive income (loss) consists of net income (loss) and other gains
       and losses affecting stockholders' equity that, under generally accepted
       accounting principles, are excluded from net income (loss). These include
       unrealized gains or losses on available-for-sale securities and foreign
       currency translation adjustments. Unrealized gain (loss) on investment
       securities included in comprehensive income (loss) for 1999 and 1998 is
       net of the reclassification adjustment for losses included in net income
       (loss) of approximately $72,000 and $24,700, respectively.

       Business Segments

       In 1998, we adopted SFAS No. 131, Disclosures about Segments of an
       Enterprise and Related Information. SFAS No. 131 requires an enterprise
       to report segment information based on how management internally
       evaluates the operating performance of its business units (segments). Our
       operations are confined to one business segment, the development of drugs
       to treat chronic infectious diseases.

       Stock-Based Compensation

       We account for stock option plans for employees in accordance with the
       provisions of Accounting Principles Board (APB) Opinion No. 25,
       Accounting for Stock Issued to Employees, and related interpretations. As
       such, compensation expense related to employee stock options is recorded
       if, on the date of grant, the fair value of the underlying stock exceeds
       the exercise price. We apply the disclosure-only requirements of SFAS No.
       123, Accounting for Stock-Based Compensation, which allows entities to
       continue to apply the provisions of APB Opinion No. 25 for transactions
       with employees, and to provide pro forma results of operations
       disclosures for employee stock option grants made in 1995 and subsequent
       years as if the fair-value-based method of accounting in SFAS No. 123 had
       been applied to those transactions.

       Income (Loss) Per Share

       Basic income (loss) per share is computed on the basis of the weighted
       average number of shares of common stock outstanding for the year.
       Diluted income (loss) per share is computed on the basis of the weighted
       average number of shares of common stock plus dilutive potential shares
       outstanding using the treasury stock method. Potential dilutive shares of
       common stock consist of shares issuable to holders of unexercised
       employee stock options and warrants outstanding.

       Use of Estimates

       The preparation of financial statements in conformity with generally
       accepted accounting principles requires management to make estimates and
       assumptions that affect the reported amounts of assets and liabilities
       and disclosure of contingent assets and liabilities at the date of the
       financial statements and the reported amounts of revenues and expenses
       during the reporting period. Actual results could differ from those
       estimates.

       Impairment of Long-Lived Assets

       We review our long-lived assets for impairment whenever events or changes
       in circumstances indicate that the carrying amount of an asset may not be
       recoverable. Recoverability of assets held and used is measured by a
       comparison of the carrying amount of an asset to future net cash flows
       expected to be generated by the asset. If such assets are considered to
       be impaired, the impairment to be recognized is measured by the amount by
       which the carrying amount of the assets exceeds the fair value of the
       assets. Assets to be disposed of are reported at the lower of their
       carrying amount or fair value less costs to sell.


                                      F-9
<PAGE>


       (2)  Investment Securities

       The following summarizes our investment securities at December 31:

<TABLE>
<CAPTION>

                                                        GROSS                  GROSS
                                                      UNREALIZED             UNREALIZED              MARKET
                                                    AMORTIZED COST             GAINS                 LOSSES                VALUE
                                                    --------------             -----                 ------                -----

<S>                                              <C>                    <C>                 <C>                 <C>

1999:
    U.S. Treasury notes                               $   913,453              $     --            $ (10,078)          $   903,375
    Federal mortgage notes                              2,874,782                   816              (31,197)            2,844,401
    Corporate obligations                              31,056,356                 9,343             (263,737)           30,801,962
                                                      -----------              --------            ---------           -----------
                                                      $34,844,591              $ 10,159            $(305,012)          $34,549,738
                                                      ===========              ========            ==========          ===========

1998:
    Federal mortgage notes                            $ 2,629,558              $ 12,350            $  (4,034)          $ 2,637,874
    Municipal bonds                                       452,362                    52                   --               452,414
    Corporate obligations                              43,653,353               182,268              (57,519)           43,778,102
                                                      -----------              --------            ---------           -----------
                                                      $46,735,273              $194,670            $ (61,553)          $46,868,390
                                                      ===========              ========            =========           ===========

</TABLE>


       Amortized cost and market value of investment securities at December 31,
       1999, by contractual maturity are shown below. Actual maturities may
       differ from contractual maturities because borrowers may have the right
       to call or prepay obligations with or without call or prepayment
       penalties.

<TABLE>
<CAPTION>

                                                                           AMORTIZED               MARKET
                          MATURITIES                                         COST                  VALUE
                                                                             ----                  -----

<S>                                                                   <C>                     <C>

Due in 1 year or less                                                    $ 9,810,325             $ 9,748,786
Due between 1 year to 5 years                                             19,045,123              18,857,186
Due between 5 years to 10 years                                            1,818,355               1,809,653
Due after 10 years                                                         4,170,788               4,134,113
                                                                         -----------             -----------
                                                                         $34,844,591             $34,549,738
                                                                         ===========             ===========

</TABLE>


       Investment income, net includes interest of $2,849,838, $4,098,440, and
       $5,216,693 earned on investments and gains (losses) of $(143,099),
       $(42,619) and $61,405 realized upon the sale of investments for 1999,
       1998 and 1997, respectively.

(3)    Inventories

Inventories consisted of the following at December 31:

<TABLE>
<CAPTION>

                                                                             1999                    1998
                                                                             ----                    ----

<S>                                                                        <C>                     <C>

Finished goods                                                            $ 2,433,718              $4,174,206
Work in progress                                                            2,907,128               2,747,380
Raw materials and supplies                                                  9,272,539               2,986,330
                                                                          -----------              ----------
                                                                          $14,613,385              $9,907,916
                                                                          ===========              ==========

</TABLE>


(4)    License Agreement

       Effective September 30, 1998, we entered into a license agreement with
       Bristol-Myers Squibb to obtain exclusive worldwide rights to PA-1806, a
       patented chemical compound in the monobactam class of antibiotics.
       PathoGenesis obtained the rights to PA-1806 for inhaled, non-systemic
       administration of the compound for the treatment or prophylaxis of
       respiratory tract infectious diseases. The initial payment obligation for
       this license of $4.0 million was charged to expense as license fee in
       1998. Payment of $2.0 million was made in October 1998, with the $2.0
       million balance paid in January 1999. Subsequent payments totaling $4.0
       million could be made upon accomplishment of certain milestones. We will
       pay a royalty on net sales of products using the chemical compound.

(5)    Acquisition of License Rights

       In 1994, we entered into license agreements with the Cystic Fibrosis
       Foundation and another party to obtain worldwide rights to TOBI. Pursuant
       to our license agreement with the foundation, we were required to make
       royalty payments of 2.5% on net product sales through the patent
       expiration date of TOBI. In 1998, we acquired the foundation's rights in
       TOBI for payments totaling $16.0 million, to be made in three equal
       annual installments.


                                      F-10
<PAGE>


       The purchase amount has been recorded on our consolidated balance sheet
       at the net present value of the required cash payments, using a discount
       rate of 9%. The value of the license rights is being amortized to cost of
       sales over the remaining life of the TOBI patent. Accumulated
       amortization totaled $1,123,939 and $153,131 at December 31, 1999 and
       1998, respectively.

       A corresponding discounted liability has been recorded for the remaining
       installment payment obligation to the foundation. The discount is being
       amortized to interest expense over the installment term, using the
       effective interest method. The $5,333,333 portion of the purchase price
       payable after December 31, 1999 is secured by an irrevocable standby
       letter of credit issued by a bank. This letter of credit is secured by
       our investment securities.

(6)  Stockholders' Equity

       Common Stock

       Effective June 25, 1997, our stockholders approved an increase in the
       authorized number of shares of PathoGenesis' $0.001 par value common
       stock to 60,000,000 shares.

       Stock Option Plans

       In 1992, we adopted the 1992 Stock Option Plan, under which 1,500,000
       shares of common stock were authorized to be reserved for grants. At
       December 31, 1999, 27,141 shares remained available for future awards.
       Options granted under that plan may be designated as qualified or
       nonqualified at the discretion of the compensation and nominating
       committee of the board of directors.

       In 1997, we adopted the 1997 Stock Option Plan, under which 2,000,000
       shares of common stock were reserved for grants. At December 31, 1999,
       128,126 shares remained available for future awards. Options granted
       under that plan may be designated as qualified or nonqualified at the
       discretion of the compensation and nominating committee of the board of
       directors. A number of options were granted in 1997 under the plan before
       the plan received stockholder approval. This resulted in deferred
       compensation of approximately $1,594,000, based on the excess of the fair
       market value of the stock at the time of plan approval (measurement date)
       over the exercise price, which was based on the fair value of the stock
       at the time of option grant. Deferred compensation of approximately
       $201,000 was recognized in 1998 as a result of option grants to
       consultants. Deferred compensation is being amortized on the
       straight-line method over the vesting period of the options.

       In 1999, we adopted the 1999 Employee Stock Option Plan, under which
       600,000 shares of common stock were reserved for grants. At December 31,
       1999, 148,100 shares remained available for future awards. Options
       granted under that plan are designated as nonqualified.

       In 1999, we also adopted the 1999 Stock Plan, under which 800,000 shares
       of common stock were reserved for grants. At December 31, 1999, 290,000
       shares remained available for future awards. Options granted under that
       plan may be designated as qualified or nonqualified at the discretion of
       the compensation and nominating committee of the board of directors.

       In 1996, we adopted the 1996 Directors Stock Option Plan (Directors Plan)
       for nonemployee directors, under which 300,000 shares of common stock
       were reserved for grants. Upon adoption of the 1997 Stock Option Plan,
       the Directors Plan was terminated with no further grants to be made.

       Generally, options vest over a four-year period in installments of 25%
       each year beginning one year from the date of grant. However, certain
       options can vest upon grant. Vested options may be exercised at any time
       before their expiration date. All options expire not later than 10 years
       from the date of grant. Qualified stock options are exercisable at not
       less than the fair market value of the stock at the date of grant.
       Nonqualified stock options are exercisable at prices determined at the
       discretion of the board of directors, but not less than 85% of the fair
       market value of the stock at the date of grant.

                                      F-11
<PAGE>



A summary of stock options follows:


<TABLE>
<CAPTION>

                                                                                                                        WEIGHTED
                                                                                             1999                       AVERAGE
                                                  1992        DIRECTORS        1997        EMPLOYEE      1999 STOCK     EXERCISE
                                               STOCK PLAN        PLAN       STOCK PLAN    STOCK PLAN        PLAN         PRICE
                                               ----------        ----       ----------    ----------        ----         -----

<S>                                         <C>              <C>           <C>           <C>            <C>             <C>

Balances at December 31,  1996                    1,224,775        42,000            --             --            --        $12.73
Granted                                             134,205            --       658,995             --            --         26.04
Canceled                                            (33,108)           --       (19,150)            --            --         18.52
Exercised                                          (169,543)       (8,000)                          --            --         12.10
                                                 ----------       -------     ---------        --------      -------        ------

Balances at December 31, 1997                     1,156,329        34,000       639,845             --            --         18.51
Granted                                                  --            --       683,597             --            --         34.95
Canceled                                            (20,125)           --       (47,523)            --            --         27.23
Exercised                                           (74,766)           --       (15,165)            --            --         15.28
                                                 ----------       -------     ---------        --------      -------        ------

Balances at December 31, 1998                     1,061,438        34,000     1,260,754             --            --         23.15
Granted                                                  --            --       735,792        520,300       510,000         25.09
Canceled                                             (3,087)           --      (139,837)       (68,400)           --         29.37
Exercised                                           (31,044)           --        (6,638)            --            --         14.37
                                                 ----------       -------     ---------        --------      -------        ------

Balances at December 31, 1999                     1,027,307        34,000     1,850,071        451,900       510,000        $23.78
                                                 ==========       =======     =========        ========      =======        ======

</TABLE>


       The weighted average fair value of options granted was $13.91, $17.76 and
       $14.06 in 1999, 1998 and 1997, respectively.

       Had compensation cost for our stock compensation plans been determined
       consistent with SFAS No. 123, our net income (loss) and income (loss) per
       share would have been adjusted to the pro forma amounts indicated below:

<TABLE>
<CAPTION>

                                                                      1999                    1998                    1997
                                                                      ----                    ----                    ----

<S>                                                              <C>                         <C>                <C>

Net income (loss) - as reported                                   $ (8,195,418)              $ 1,882,901         $(33,037,730)
Net loss - pro forma                                               (23,976,911)               (7,745,344)          (38,075,062)
Income (loss) per share - as reported:
    Basic                                                                (0.50)                      0.12                (2.10)
    Diluted                                                              (0.50)                      0.11                (2.10)
Loss per share - pro forma:
    Basic                                                                (1.46)                    (0.48)                (2.42)
    Diluted                                                              (1.46)                    (0.48)                (2.42)

</TABLE>


       The fair value of each option grant is estimated on the date of grant
       using the Black-Scholes option-pricing model with the following
       assumptions used for grants: dividend yield of 0.0% for all years;
       expected volatility of 59% to 83% for 1999, 56% to 59% for 1998 and 58%
       to 64% for 1997; risk-free interest rate of 4.60% to 6.27% for 1999,
       4.31% to 5.72% for 1998 and 5.72% to 6.44% for 1997; expected lives from
       three to six years for all years.


                                      F-12
<PAGE>


The following table summarizes information about stock options outstanding at
December 31, 1999:


<TABLE>
<CAPTION>

                                       TOTAL OPTIONS                                                  EXERCISABLE OPTIONS
                                       -------------                                                  -------------------
                                                        WEIGHTED
                                                         AVERAGE              WEIGHTED                               WEIGHTED
         RANGE OF                                       REMAINING             AVERAGE                                 AVERAGE
         EXERCISE                NUMBER OF             CONTRACTUAL            EXERCISE           NUMBER OF           EXERCISE
          PRICES                   SHARES                 LIFE                 PRICE               SHARES              PRICE
          ------                   ------                 ----                 -----               ------              -----

<S>                             <C>                    <C>                    <C>                <C>                 <C>

        $10.00 to 19.69             2,066,152              7.6 years              $13.54             999,690             $13.12
         20.00 to 29.94               684,954              7.3 years               24.64             396,293              24.59
         30.25 to 49.44               670,222              8.2 years               36.61             237,885              36.19
         50.25 to 56.63               451,950              9.1 years               50.27             125,000              50.25
                                    ---------                                                      ---------
        $10.00 to 56.63             3,873,278              7.8 years              $23.78           1,758,868             $21.47
                                    =========                                                      =========

</TABLE>


       Common Stock Warrants

       As of December 31, 1999, we had outstanding warrants, with expiration
       terms ranging from April 22, 2000 to February 6, 2001, to purchase 28,223
       shares of common stock, substantially all of which are fully exercisable
       at $14.40 per share.

       Shareholder Rights Plan

       The board of directors adopted a Shareholder Rights Plan in 1997 and
       declared a dividend of one right for each outstanding share of common
       stock. Such rights only become exercisable after a person or group, whose
       action has not received prior approval from the board of directors,
       acquires beneficial ownership of, or commences a tender or exchange offer
       for, 15% or more of our common stock. Each right then may be exercised to
       acquire one one-thousandth of a share of preferred stock, designated as
       Series A Junior Preferred Stock, at an exercise price of $250, subject to
       adjustment. We may redeem the rights at $0.01 per right at any time until
       the 10th day following the public announcement that a 15% position has
       been acquired. The rights expire on June 26, 2007.

       Employee Stock Purchase Plan

       On June 3, 1998, we adopted an employee stock purchase plan, effective
       July 1, 1998, for all eligible employees. Under the plan, shares of
       PathoGenesis common stock may be purchased at 85% of the fair market
       value on the subscription date or purchase date, whichever is lower. Each
       subscription has a two-year term, with share purchases made at the end of
       each six-month period. The aggregate price for shares purchased by an
       employee may not exceed $25,000 annually (subject to limitations imposed
       by the Internal Revenue Code). The plan expires on June 30, 2008 and a
       total of 200,000 shares are available for purchase under the plan. We
       issued 63,061 shares for employee stock purchases in 1999. At December
       31, 1999, 136,939 shares were available for purchase under the plan. Pro
       forma compensation expense is recognized for the fair value of each
       employee stock purchase right estimated on the date of grant using the
       Black-Scholes pricing model. The following assumptions were used for
       employee stock purchases in 1999: expected volatility of 58% to 84%;
       risk-free interest rates of 4.52% to 5.90%; expected lives of six months
       to two years; and zero dividend yield. The weighted average fair value of
       employee stock purchase rights granted in 1999 was $6.93.


                                      F-13
<PAGE>


(7)    Income (Loss) Per Share

The following table sets forth the computation of basic and diluted income
(loss) per share of common stock:

<TABLE>
<CAPTION>


                                                                           1999                   1998              1997
                                                                           ----                   ----              ----

<S>                                                                    <C>                      <C>              <C>

Basic income (loss) per share computation:
Numerator:
Net income (loss)                                                      $ (8,195,418)           $ 1,882,901       $(33,037,730)
                                                                       ------------            -----------       ------------

Denominator:
Weighted average common shares                                           16,406,734             16,265,452         15,704,151
                                                                       ------------            -----------       ------------

Basic income (loss) per share                                          $      (0.50)           $      0.12       $      (2.10)
                                                                       ============            ===========       ============

Diluted income (loss) per share computation:
Numerator:
Net income (loss)                                                      $ (8,195,418)           $ 1,882,901       $(33,037,730)
                                                                       ------------            -----------       ------------

Denominator:
Weighted average common shares                                           16,406,734             16,265,452         15,704,151
Effect of dilutive securities:
Common stock warrants                                                            --                 35,146                 --
Stock options                                                                    --                855,093                 --
                                                                       ------------            -----------       ------------

Dilutive potential common shares                                                 --                890,239                 --
                                                                       ------------            -----------       ------------

Denominator for diluted income (loss) per Share                          16,406,734             17,155,691         15,704,151
                                                                       ------------            -----------       ------------

Diluted income (loss) per share                                        $      (0.50)           $      0.11       $      (2.10)
                                                                       ============            ===========       ============


</TABLE>

       Options and warrants to purchase 3,371,353, 253,705 and 2,118,198 shares
       of common stock during 1999, 1998, and 1997, respectively, were not
       included in the computation of diluted income (loss) per share because
       the representative share increments would be antidilutive.

(8)    Income Taxes

       Our reported federal income taxes differ from the amounts computed by
       applying the U.S. federal income tax rate of 34% to pretax income or loss
       due to limitations on using net operating loss carryforwards in 1999 and
       1997, and due to the utilization of net operating loss carryforwards in
       1998.

       The tax effects of temporary  differences and  carryforwards  that give
       rise to deferred tax assets at December 31 are as follows:

<TABLE>
<CAPTION>

                                                                                             1999                    1998
                                                                                             ----                    ----

<S>                                                                                         <C>                   <C>
Deferred tax assets:
    Orphan drug credit carryforwards                                                       $ 5,010,532           $ 5,010,532
    License agreements                                                                         186,006             1,571,066
    Research and experimentation credit carryforwards                                        1,536,596             1,238,499
    Net operating loss carryforwards                                                        34,216,788            30,482,177
    Other                                                                                    2,489,415             1,482,073
                                                                                           -----------           -----------

        Total gross deferred tax assets                                                     43,439,337            39,784,347
Less valuation allowance                                                                    43,439,337            39,784,347
                                                                                           -----------           -----------

    Net deferred tax assets                                                                $        --           $        --
                                                                                           ===========           ===========

</TABLE>


                                      F-14
<PAGE>


       The valuation allowance for deferred tax assets increased by $3,654,990
       and $59,787 in 1999 and 1998, respectively. The change in 1999 is
       primarily attributable to the increase in net operating loss
       carryforwards whose utilization cannot be reasonably assured.

       At December 31, 1999, we had net operating loss carryforwards of
       approximately $100,637,000 and tax credit carryforwards of approximately
       $6,548,000, which are available to offset future federal taxable income
       and income taxes, respectively, if any, and expire beginning in 2007.
       Approximately $6,143,000 of the net operating loss carryforwards result
       from stock option deductions which, when and if realized, would result in
       a credit to stockholders' equity.

(9)    Lease Commitments

       We lease various office and research facilities under noncancelable
       operating leases which expire between 2001 and 2003.

       Minimum future lease payments under noncancelable operating leases and
       related sublease income as of December 31, 1999 are as follows:


<TABLE>
<CAPTION>

                             LEASE PAYMENTS              SUBLEASE INCOME
                             --------------              ---------------

<S>                       <C>                            <C>

2000                             $2,991,000                     $333,000
2001                              2,957,000                           --
2002                              1,872,000                           --
2003                                325,000                           --
                                 ----------                     --------
                                 $8,145,000                     $333,000
                                 ==========                     ========

</TABLE>


Rent expense for operating leases was approximately $2,578,000, $2,531,000 and
$2,002,000 for 1999, 1998 and 1997, respectively.

(10)   Employee Benefits

       As a retirement plan, we offer a defined contribution plan covering
       substantially all full-time and part-time U.S. employees. The plan is a
       salary deferral arrangement pursuant to Internal Revenue Code section
       401(k) and is subject to the provisions of the Employee Retirement Income
       Security Act of 1974. In April 1999, we began discretionary contributions
       of 50% of the first 3% of compensation that a participant contributes to
       the plan. We recorded expense resulting from matching contributions to
       the plan of $122,251 in 1999.

(11)   Facility Agreement

       In February 1999, we entered into a facility agreement with Harris Trust
       and Savings Bank. The agreement provides us with a $10.0 million
       revolving line of credit in the form of short-term demand loans. The
       loans may bear interest at floating rates based on LIBOR (London
       Interbank Offering Rate), the bank's prime commercial rate or a
       combination of both, and may be converted from one basis to another from
       time to time in accordance with the terms of the agreement. The credit
       facility, subject to annual review, will be available to us on an
       uncommitted basis. We have not drawn funds under this facility agreement
       to date.

(12)   Subsequent Events

       Collaboration and Investment Agreements

       In January 2000, we entered into a collaboration with Chiron Corporation
       to discover and develop new antibiotics. The collaboration combines
       Chiron's combinatorial chemistry library and expertise in high-throughput
       screening with our strengths in bacterial target discovery and antibiotic
       development, as well as our knowledge of the P. aeruginosa genome. The
       focus of this collaboration is on the discovery of novel treatments for
       infectious diseases, specifically antibiotics with new mechanisms of
       action to address serious medical needs, such as antibiotic resistance.

       In March 2000, we entered into an agreement with AeroGen, Inc. to
       collaborate on the development and registration of a product combining
       TOBI and AeroGen's hand-held, portable AeroDose(TM) Inhaler. Our goal is
       to reduce TOBI's delivery time from 15-20 minutes to 5-10 minutes or
       less. Under the development and supply agreement, we will reimburse
       AeroGen for costs incurred in developing the AeroDose Inhaler and will
       obtain worldwide exclusive distribution rights to the product. AeroGen
       will receive royalties on all product sales. Under a separate agreement,
       we invested $2.5 million in

                                      F-15
<PAGE>


       the convertible preferred stock of privately held AeroGen. This
       investment will be accounted for under the cost method.

       Legal Proceedings

       On February 18, 2000, the United States District Court for the Western
       District of Washington dismissed with prejudice all eight consolidated
       putative class action lawsuits that had been filed in March and April
       1999 against PathoGenesis Corporation, our chief executive officer and
       our chief financial officer. The eight consolidated lawsuits (Lipton v.
       PathoGenesis et al., C99-0419; Green v. PathoGenesis et al., C99-0439;
       Gellert v. PathoGenesis et al., C99-0452; May v. PathoGenesis et al.,
       C99-0453; Shapiro v. PathoGenesis et al., C99-0455; Bassin v.
       PathoGenesis et al., C99-0469; Barker v. PathoGenesis et al., C99-0503;
       and Kralovk v. PathoGenesis et al., C99-0506) purported to allege claims
       on behalf of all purchasers of PathoGenesis common stock during the
       period January 15, 1999 to March 22, 1999. Plaintiffs had claimed that
       the company and the officers violated certain provisions of the federal
       securities laws by making statements in early 1999 regarding the
       company's 1998 financial results. The court's order dismissed the
       consolidated cases and bars plaintiffs from filing another lawsuit on the
       matter. Plaintiffs have appealed the dismissal order to the United States
       Court of Appeals for the Ninth Circuit. We intend to defend the appeal
       vigorously. Although we cannot ascertain the ultimate outcome of the
       appeal at this time or predict with certainty the results of legal
       proceedings, we currently believe that the resolution of the appeal will
       not have a material adverse effect on our financial position or results
       of operations.

(13)   Quarterly Financial Information (Unaudited) (in thousands, except per
       share data)


<TABLE>
<CAPTION>

1999 QUARTERS                                                          FIRST           SECOND           THIRD           FOURTH
                                                                       -----           ------           -----           ------

<S>                                                                <C>              <C>               <C>           <C>

Revenues                                                                 $ 10,260         $14,301           $16,461       $ 19,822
Net loss                                                                   (4,738)         (2,500)             (783)          (175)
Loss per share - basic and diluted                                       $  (0.29)        $ (0.15)          $ (0.05)      $  (0.01)
Weighted average common shares outstanding - basic and diluted             16,379          16,394            16,405         16,448

1998 QUARTERS                                                          FIRST           SECOND           THIRD           FOURTH
                                                                       -----           ------           -----           ------

Revenues                                                                 $ 14,665        $ 13,650           $14,901       $ 17,836
Net income (loss)                                                             985             982            (3,002)         2,919
Income (loss) per share - basic                                          $   0.06        $   0.06           $ (0.18)      $   0.18
Income (loss) per share - diluted                                        $   0.06        $   0.06           $ (0.18)      $   0.17
Weighted average common shares outstanding - basic                         16,243          16,253            16,264         16,302
Weighted average common shares outstanding - diluted                       17,146          17,096            16,264         17,456


</TABLE>


                                      F-16
<PAGE>


                                   SIGNATURES

      Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized, in the City of
Seattle, State of Washington, on March 28, 2000.

                                      PATHOGENESIS CORPORATION

                                      By: /s/ Wilbur H. Gantz
                                          -----------------------
                                          Wilbur H. Gantz
                                          Chairman and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following persons on behalf of the registrant and
in the capacities and on the dates indicated.


<TABLE>
<CAPTION>


                 SIGNATURE                                      TITLE


<S>                                        <C>                                      <C>

            /s/ Wilbur H. Gantz               Chairman, Chief Executive)                     March 28, 2000
----------------------------------------      Officer, President and
              Wilbur H. Gantz                 Director (Principal Executive
                                                     Officer)

             /s/ Alan R. Meyer                Executive Vice President,)                     March 28, 2000
----------------------------------------      Chief Financial Officer and
               Alan R. Meyer                  Director (Principal Financial
                                              and Accounting Officer)

             /s/ John L. Gordon               Director                                       March 28, 2000
----------------------------------------
               John L. Gordon


           /s/ Elizabeth Greetham             Director                                       March 28, 2000
----------------------------------------
             Elizabeth Greetham

         /s/ Michael J. Montgomery            Director                                       March 28, 2000
----------------------------------------
           Michael J. Montgomery


           /s/ Arthur W. Nienhuis             Director                                       March 28, 2000
----------------------------------------
             Arthur W. Nienhuis


            /s/ Talat M. Othman               Director                                       March 28, 2000
----------------------------------------
              Talat M. Othman


             /s/ Eugene L. Step               Director                                       March 28, 2000
----------------------------------------
               Eugene L. Step


             /s/ James R. Tobin               Director                                       March 28, 2000
----------------------------------------
               James R. Tobin

              /s/ Fred Wilpon                 Director                                       March 28, 2000
----------------------------------------
                Fred Wilpon


</TABLE>


                                      S-1
<PAGE>



                                  EXHIBIT INDEX

<TABLE>
<CAPTION>

  NO.                                      DESCRIPTION OF EXHIBIT
  ---                                      ----------------------

<S>          <C>


3.1(a)        Amended and Restated Certificate of Incorporation, as amended (incorporated by
              reference to Exhibit 3.1 to the Company's Registration Statement on Form S-1,
              Registration No. 333-22297).

3.1(b)        Certificate of Amendment of Amended and Restated Certificate of
              Incorporation (incorporated by reference to Exhibit 4.1(b) to the
              Company's Registration Statement on Form S-8, Registration No.
              333-45571).

3.1(c)        Certificate of Designations (incorporated by reference to Exhibit 4.3 to
              the Company's Registration Statement on Form S-8, Registration No. 333-45571).

3.1(d)        Composite Certificate of Incorporation, as amended (incorporated
              by reference to Exhibit 3.1(d) to the Company's Quarterly Report
              on Form 10-Q for the Three Months Ended March 31, 1998, Commission
              File No. 027150).

3.2           By-Laws, as amended through June 3, 1999 (incorporated by
              reference to Exhibit 3.2 to the Company's Quarterly Report on Form
              10-Q for the Three Months Ended June 30, 1999, Commission File No.
              027150).

4.1(a)        Form of Stock Certificate (incorporated by reference to Exhibit 4.1
              to the Company's Registration Statement on Form S-1,
              Registration No. 33-97070).

4.1(b)        Rights Agreement dated as of June 25, 1997 between the Company and
              Harris Trust and Savings Bank, as Rights Agent, including the form
              of Right Certificate as Exhibit B (incorporated by reference to
              Exhibit 1 to the Company's Current Report on Form 8-K filed on
              July 10, 1997, Commission File No. 027150).

4.1(bb)       First Amendment, dated as of March 8, 1998, to Rights Agreement
              between the Company and Harris Trust and Savings Bank, as Rights
              Agent (incorporated by reference to Exhibit 4.1(bb) to the
              Company's Annual Report on Form 10-K for 1997, Commission File No.
              027150).

4.1(bbb)      Amendment, dated as of April 13, 1999, to Rights Agreement between
              the Company and Harris Trust and Savings Bank, as Rights Agent
              (incorporated by reference to Exhibit 1 to the Company's Current
              Report on Form 8-K filed on April 15, 1999, Commission File No.
              027150).

4.1(c)        Form of Right (included in Exhibit 4.1(b)).

4.2           PathoGenesis Corporation 1992 Stock Option Plan (incorporated by
              reference to Exhibit 4.2 to the Company's Registration Statement
              on Form S-1, Registration No. 33-97070).

4.3           1996 Non-Employee Director Plan (incorporated by reference to
              Exhibit 4.3 to the Company's Annual Report on Form 10-K for 1995,
              Commission File No. 027150).


</TABLE>

                                       1
<PAGE>

<TABLE>
<CAPTION>


 NO.                               DESCRIPTION OF EXHIBIT
 ---                               ----------------------

<S>        <C>


4.4         PathoGenesis Corporation 1997 Stock Option Plan (incorporated by
            reference to Appendix A to the Company's Proxy Statement dated
            April 29, 1997, Commission File No. 027150).

4.5         PathoGenesis Corporation 1999 Employee Stock Option Plan
            (incorporated by reference to Exhibit 4.5 to the Company's Quarterly
            Report on Form 10-Q for the Three Months Ended March 31, 1999,
            Commission File No. 027150).

4.6         PathoGenesis Corporation 1999 Stock Plan (incorporated by reference
            to Appendix A to the Company's proxy statement dated April 19, 1999,
            Commission File No. 027150).

4.8         Form of Stock Option Agreement for 1997 Stock Option Plan
            (incorporated by reference to Exhibit 4.8 to the Company's Quarterly
            Report on Form 10-Q for the Three Months Ended June 30, 1999,
            Commission File No. 027150).

4.9         Form of Stock Option Agreement for 1999 Employee Stock Option Plan
            (incorporated by reference to Exhibit 4.9 to the Company's Quarterly
            Report on Form 10-Q for the Three Months Ended June 30, 1999,
            Commission File No. 027150).

4.10        Form of Stock Option Agreement for 1999 Stock Plan (incorporated by
            reference to Exhibit 4.10 to the Company's Quarterly Report on Form
            10-Q for the Three Months Ended June 30, 1999, Commission File No.
            027150).

4.11        PathoGenesis Corporation Employee Stock Purchase Plan (incorporated
            by reference to Appendix A to the Company's Proxy Statement dated
            April 20, 1998, Commission File No. 027150).

4.12(a)     PathoGenesis Corporation 401(k) Profit Sharing Plan (incorporated by
            reference to Exhibit 4.6 to the Plan's  Registration Statement on
            Form S-8, Registration No. 333-63679).

4.12(b)     Trust Agreement, dated as of April 1, 1998, between the Company and
            Wilmington Trust Company, as Trustee (incorporated by reference to
            Exhibit 4.7 to the Plan's Registration Statement on Form S-8,
            Registration No. 333-63679).

10.3        Form of Employment Agreement between the Company and A. Bruce
            Montgomery, dated September 19, 1995 (incorporated by reference to
            Exhibit 10.2 to the Company's Registration Statement on Form S-1,
            Registration No. 33-97070).

10.4        Employment Agreement between the Company and Marc F. Wipperman,
            effective as of July 1, 1996 (incorporated by reference to Exhibit
            10.4 to the Company's Registration Statement on Form S-1,
            Registration No. 333-22297).

10.11       Licensing Agreement between the Company and Kaneka Corporation,
            dated October 25, 1993 and amendment thereto, dated March 3, 1995
            (incorporated by reference to Exhibit 10.9 to the Company's
            Registration Statement on Form S-1, Registration No. 33-97070).*


</TABLE>


                                       2
<PAGE>

<TABLE>
<CAPTION>

NO.                                  DESCRIPTION OF EXHIBIT
---                                  ----------------------

<S>          <C>


10.12         Supply Agreement between the Company and Kaneka Corporation, dated
              as of October 25, 1993 (incorporated by reference to Exhibit 10.10
              to the Company's Registration Statement on Form S-1, Registration
              No. 33-97070).*

10.16         License Agreement between the Company and Children's Hospital and
              Medical Center, dated January 1, 1994 (incorporated by reference
              to Exhibit 10.14 to the Company's Registration Statement on
              Form S-1, Registration No. 33-97070).*

10.17         License Agreement between the Company and the Cystic Fibrosis
              Foundation, dated January 1, 1994 (incorporated by reference to
              Exhibit 10.15 to the Company's Registration Statement on Form S-1,
              Registration No. 33-97070).*

10.21(a)      Lease for laboratory in Seattle, Washington, between David A.
              Sabey and Sandra L. Sabey and the Company, dated June 8, 1992 (the
              "Laboratory Lease"), as amended by the Second Amendment, dated
              November 16, 1992 (incorporated by reference to Exhibit 10.18 to
              the Company's Registration Statement on Form S-1, Registration No.
              33-97070).

10.21(b)      Third Amendment to the Laboratory Lease, dated August 1, 1996
              (incorporated by reference to Exhibit 10.21 to the Company's
              Registration Statement on Form S-1, Registration No. 333-22297).

10.23(a)      Lease for the Skokie, Illinois facility, between The Equitable
              Life Assurance Society of the United States and the Company, dated
              October 1992 (the "Skokie Lease"), as amended, dated March 31,
              1995 (incorporated by reference to Exhibit 10.20 to the Company's
              Registration Statement on Form S-1, Registration No. 33-97070).

10.23(b)      Amendment to Skokie Lease, dated April 30, 1996 (incorporated by
              reference to Exhibit 10.23 to the Company's Registration Statement
              on Form S-1, Registration No. 333-22297).

10.24         Lease for Annandale, New Jersey Facility, between Exxon Research
              and Engineering Company and the Company, dated November 25, 1996
              (incorporated by reference to Exhibit 10.24 to the Company's
              Registration Statement on Form S-1, Registration No. 333-22297).

10.25         Rights Agreement dated as of June 25, 1997 between PathoGenesis
              Corporation and Harris Trust and Savings Bank, as Rights Agent,
              including the form of Right Certificate as Exhibit B, First
              Amendment to Rights Agreement, dated as of March 8, 1998 and
              Amendment dated as of April 13, 1999 (included in Exhibits 4.1(b),
              4.1(bb) and 4.1(bbb)).

10.26         1992 Stock Option Plan (included in Exhibit 4.2).

10.27         1996 Non-Employee Director Plan (included in Exhibit 4.3).

10.28         1997 Stock Option Plan and related Form of Stock Option Agreement
              (included in Exhibits 4.4 and 4.8).

</TABLE>


                                       3
<PAGE>

<TABLE>
<CAPTION>

  NO.                           DESCRIPTION OF EXHIBIT
  ---                           ----------------------

<S>           <C>


10.29          Processing Services Agreement dated as of May 5, 1998, between
               PathoGenesis Corporation and Automatic Liquid Packaging, Inc.
               (incorporated by reference to Exhibit 10.29 to the Company's
               Quarterly Report on Form 10-Q for the Three Months Ended
               March 31, 1998, Commission File No. 0-27150).*

10.30          Corporation  and the Cystic  Fibrosis  Foundation  (incorporated
               by  reference to Exhibit  10.30 to the  Company's Quarterly
               Report on Form 10-Q for the Three Months Ended June 30, 1998,
               Commission File No. 0-27150).

10.31          License Agreement between Bristol-Myers Squibb Company and
               PathoGenesis Corporation dated September 30, 1998 (incorporated
               by reference to Exhibit 10.31 to the Company's Quarterly Report
               on Form 10-Q for the Three Months Ended September 30, 1998,
               Commission File No. 0-27150).*

10.32          Form of Change in Control Employment Agreement for certain key
               employees (incorporated by reference to Exhibit 10.32 to the
               Company's Quarterly Report for the Three Months Ended June 30,
               1999, Commission File No. 0-27150).

10.33          Facility Agreement dated as of February 22, 1999 between
               PathoGenesis Corporation and Harris Trust and Savings Bank
               (incorporated by reference to Exhibit 10.33 to the Company's
               Annual Report on Form 10-K for 1998, Commission File No.
               0-27150).

10.34          1999 Employee Stock Option Plan and related Form of Stock Option
               Agreement (included in Exhibits 4.5 and 4.9).

10.35          1999 Stock Plan and related Form of Stock Option Agreement
               (included in Exhibits 4.6 and 4.10).

10.36          PathoGenesis Corporation Employee Stock Purchase Plan (included
               in Exhibit 4.11).

10.37          PathoGenesis Corporation 401(k) Profit Sharing Plan and related
               Trust Agreement (included in Exhibits 4.12(a) and 4.12(b)).

23.1           Consent of KPMG LLP.

27.1           Financial Data Schedule.

99.1           Important Information on Forward-Looking Statements.

*  Contains confidential material omitted and filed separately with the
   Securities and Exchange Commission. Brackets denote such omissions.

</TABLE>


                                       4





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