VIROPHARMA INC
10-K, 1997-03-20
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                               ----------------
 
                                   FORM 10-K
 
     (MARK ONE)
 
     [X]        ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
                   SECURITIES EXCHANGE ACT OF 1934
 
     For the fiscal year ended December 31, 1996
 
                                       OR
 
     [_]        TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
                   SECURITIES EXCHANGE ACT OF 1934
 
 
     For the transition period from        to
 
     Commission File Number:   0-21699
 
                            VIROPHARMA INCORPORATED
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER.)
 
                DELAWARE                               94-2347624
    (STATE OR OTHER JURISDICTION OF       (I.R.S. EMPLOYER IDENTIFICATION NO.)
     INCORPORATION OR ORGANIZATION)
 
        76 GREAT VALLEY PARKWAY                          19355
         MALVERN, PENNSYLVANIA                         (ZIP CODE)
    (ADDRESS OF PRINCIPAL EXECUTIVE
                OFFICES)
 
        REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: 610-651-0200
 
          Securities registered pursuant to Section 12(b) of the Act:
 
Title of each class:                         Name of each exchange on which
        None                                          registered:
                                                          None
 
          Securities registered pursuant to Section 12(g) of the Act:
 
                         Common Stock, par value $.002
 
                               ----------------
 
  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. [_]
 
  The aggregate market value of the voting stock held by non-affiliates of the
registrant was approximately $39,513,251 as of February 28, 1997, based upon
the closing sale price per share of the Common Stock, as quoted on The Nasdaq
Stock Market. This amounts excludes 6,067,729 shares of Common Stock held by
directors, officers and stockholders with representatives on the board of
directors whose ownership exceeded five percent of the Common Stock outstanding
at February 28, 1997. Exclusion of shares held by any person should not be
construed to indicate that such person possesses the power, direct or indirect,
to direct or cause the direction of the management or policies of the
registrant, or that such person is controlled by or under common control with
the registrant.
 
  The number of shares of the registrant's Common Stock outstanding as of
February 28, 1997 was 9,077,116.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
  As stated in Part III of this Annual Report on Form 10-K, portions of the
registrant's definitive proxy statement (the "Proxy Statement") for the
registrant's 1997 Annual Meeting of Stockholders to be held on May 28, 1997 are
incorporated by reference in Part III of this Annual Report on Form 10-K.
 
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                      DOCUMENTS INCORPORATED BY REFERENCE

As stated in Part III of this Annual Report on Form 10-K, portions of the
registrant's definitive proxy statement (the "Proxy Statement") for the
registrant's 1997 Annual Meeting of Stockholders to be held on May 28, 1997 are
incorporated by reference in Part III of this Annual Report on Form 10-K.
<PAGE>
 
                            VIROPHARMA INCORPORATED

                            FORM 10-K ANNUAL REPORT
                    For Fiscal Year Ended December 31, 1996

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
 
                                                                            Page
                                                                            ----
<S>        <C>                                                              <C>
 
PART I
 
Item 1.    Business .......................................................    1
Item 2.    Properties .....................................................   18
Item 3.    Legal Proceedings ..............................................   18
Item 4.    Submission of Matters to a Vote of Security Holders ............   18
                             
 
PART II
 
Item 5.    Market for the Registrant's Common Equity and                       
              Related Stockholder Matters .................................   21
Item 6.    Selected Financial Data.........................................   22
Item 7.    Management's Discussion and Analysis of                            
              Financial Condition and Results of Operations................   23
Item 8.    Financial Statements and Supplementary Data ....................   25
Item 9.    Changes in and Disagreements with Accountants      
              on Accounting and Financial Disclosure ......................   25
 
PART III

Item 10.   Directors and Executive Officers of the Registrant .............   25
Item 11.   Executive Compensation .........................................   25
Item 12.   Security Ownership of Certain Beneficial 
              Owners and Management .......................................   25
Item 13.   Certain Relationships and Related Transactions .................   25
 
PART IV
 
Item 14.   Exhibits, Financial Statement Schedules, and     
              Reports on Form 8-K .........................................   26
  
Index to Financial Statements and Schedules ...............................  F-1
</TABLE>

       This Annual Report on Form 10-K contains forward-looking statements which
involve risks and uncertainties. The Company's actual results may differ
significantly from the results discussed in forward-looking statements. Factors
that might cause or contribute to such differences include, but are not limited
to, those discussed in "Important Factors Regarding Forward-Looking Statements"
attached hereto as Exhibit 99.

       Unless the context indicates otherwise, the terms "ViroPharma" and
Company refer to ViroPharma Incorporated. "ViroPharma" is a trademark and
service mark of the Company. The Company has filed applications to register the
trademark and service mark in the United States and Canada. All other brand
names or trademarks appearing in this Annual Report on Form 10-K are the
property of their respective owners.

                                      -i-
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                                     PART I

                                    BUSINESS

  Overview

       ViroPharma is engaged in the discovery and development of proprietary
  antiviral pharmaceuticals for the treatment of diseases caused by RNA viruses.
  The Company has focused its current drug development and discovery activities
  on a number of RNA virus diseases including viral meningitis, hand-foot-and-
  mouth disease, "summer flu," the common cold, influenza, hepatitis C and viral
  pneumonia. Each year, the majority of the world's population is afflicted by
  at least one of these diseases, for which antiviral therapies are currently
  either inadequate or unavailable. The Company's most advanced compound,
  pleconaril, is currently being developed for the treatment of four of these
  diseases. ViroPharma has completed a Phase IIa clinical trial which
  demonstrated that all disease measures were significantly reduced for the
  pleconaril treated group in "summer flu." The Company is conducting a Phase
  IIb clinical trial with pleconaril for viral meningitis, has initiated a Phase
  II clinical trial for hand-foot-and-mouth disease and anticipates initiating a
  Phase II clinical trial for the common cold in patents with asthma and an
  additional Phase II clinical trial for "summer flu" in late 1997. The Company
  has additional compounds in research and preclinical stages of development for
  treatment of influenza, hepatitis C and viral pneumonia. ViroPharma believes
  its drug discovery and development technologies and expertise have potential
  applicability to a broad range of diseases caused by RNA viruses.

       RNA viruses are responsible for the majority of human viral diseases,
  causing illnesses ranging from acute and chronic ailments to fatal infections.
  RNA viruses continue to emerge, spreading from rural and developing regions of
  the world to urbanized centers. Despite efforts by the scientific and medical
  communities to develop vaccines and pharmaceuticals to prevent and treat
  certain of these diseases, medicines are currently inadequate or are not
  available for the majority of RNA virus diseases. The Company believes the
  significance and prevalence of RNA virus diseases, and the limited
  availability and effectiveness of current antiviral therapeutics, has created
  a compelling need for antiviral pharmaceuticals to treat these diseases.

  Diseases Caused By RNA Viruses

       Viruses are intracellular parasites that require a living host cell
  within which to reproduce. They are composed of genetic material enclosed in a
  protective protein coat. The genetic material of a virus, which may be in the
  form of either deoxyribonucleic acid ("DNA") or ribonucleic acid ("RNA"), is
  unique and characteristic of that virus and provides the blueprint for virus
  reproduction.

       There are three fundamental classes of viruses: DNA viruses, retroviruses
  and RNA viruses. DNA viruses store their genetic material as DNA and replicate
  their DNA in a manner similar to human cells. Retroviruses and RNA viruses
  store their genetic material as RNA. Retroviruses reproduce by first
  converting their RNA into DNA in infected cells, then converting this DNA back
  into RNA. RNA viruses, on the other hand, have the unique ability to directly
  reproduce their RNA to create new RNA virus offspring through a process known
  as RNA replication. This ability to directly replicate RNA distinguishes RNA
  viruses from DNA viruses, retroviruses and human cells.

       Infection by viruses, and their ensuing replication, can lead to disease.
  Viral epidemics, pandemics, acute outbreaks and chronic diseases continue to
  cause an enormous amount of human suffering and death. DNA viruses cause
  diseases such as herpes, hepatitis B and papillomas (warts). The retrovirus
  HIV (human immunodeficiency virus) causes AIDS. RNA viruses, however, are
  responsible for the majority of human viral diseases, causing a multitude of
  illnesses ranging from acute and chronic ailments to fatal infections.

                                      -1-
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  The following is a list of selected diseases caused by RNA viruses:
<TABLE>
<CAPTION>
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                               RNA Virus Diseases
<S>                          <C>                         <C>
 
Bronchiolitis                Enterovirus meningitis      Myocarditis
Dengue fever                 Hantavirus pulmonary        Pneumonia
Diarrhea diseases             syndrome                   Rabies
Ebola fever                  Hemorrhagic conjunctivitis  Rhinovirus common cold
Encephalitis                 Hemorrhagic fevers          Rubella
Enterovirus "summer flu"     Hepatitis C, A, D and E     Tick fevers
Enterovirus                  Influenza                   Yellow fever
 hand-foot-and-mouth         Measles                        
 
 
The Company has focused its current drug development and discovery activities
 on the italicized diseases.
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</TABLE>

[Please note that the italicized diseases are: Enterovirus "summer flu,"
Hepatitis C, Influenza, Enterovirus meningitis, Pneumonia and Rhinovirus common
cold. The language in these brackets is for purposes of the EDGAR filing only
and will not appear in the printed copy of this report.]


       The medical community has attempted to address several of these diseases
  with vaccines, which are prophylactic in nature and intended to prevent
  disease, and antiviral pharmaceuticals, which are therapeutic in nature and
  intended to treat disease. For most RNA virus diseases, however, medicines are
  either inadequate or simply not available.

       Vaccines are designed to prevent disease by eliciting a protective
  antiviral immune response in vaccinated individuals. This response involves
  the production by the body of specific antibodies and white blood cells, both
  of which attempt to destroy the virus and virus-infected cells. Vaccines do
  not exist for most RNA virus diseases. Of those that are available, most are
  unable to effectively control disease for one or more reasons. Many viruses
  constantly and rapidly change their outer surface, thereby rendering existing
  vaccines obsolete. Moreover, many individuals at greatest risk for serious
  disease, including the young, the elderly and the immunocompromised, fail to
  respond to vaccines. Finally, existing vaccines are not readily available to
  certain susceptible populations and, even when available, are often not widely
  used.

       Antiviral pharmaceuticals to treat RNA virus diseases are limited. While
  there are, in some cases, medicines available to reduce disease symptoms,
  there are few drugs to effectively treat the underlying disease. Of these,
  amantadine and the related drug rimantadine are used for influenza, ribavirin
  has been used for viral pneumonia due to respiratory syncytial virus ("RS
  virus"), and interferon alfa ("IFN") is currently used to treat hepatitis due
  to hepatitis C virus ("HCV"). Additionally, immunoglobulin products are
  occasionally used for treatment of some RNA virus diseases.

       Based on the significance and prevalence of disease associated with RNA
  virus infections and the limited means to prevent or treat these diseases, the
  Company believes that there is a significant market opportunity for the
  development of effective therapeutics for RNA virus diseases. Moreover, the
  continued emergence of RNA virus diseases and the recent spread of RNA viruses
  from rural and developing regions of the world to urbanized centers
  underscores the compelling need for new antiviral pharmaceuticals.

  Treating RNA Virus Diseases

      The RNA Virus Replication Process

       Essential to the discovery and development of antiviral pharmaceuticals
  is the ability to analyze the virus in a laboratory setting and to dissect the
  molecular and biochemical events critical to virus replication. The
  manipulation of RNA viruses and, in particular, the virus's RNA genome,
  requires special techniques and skills. Historically, technical limitations
  have hampered investigation of RNA virus replication. Consequently, the
  scientific community's understanding of the molecular events of RNA virus
  replication is incomplete. However, significant recent

                                      -2-
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  advancements in biological and molecular technologies related to the
  manipulation of RNA and RNA viruses have enabled the Company to pursue the
  discovery and development of effective treatments for RNA virus diseases.

       The Company believes that the process of viral RNA uncoating and
  replication represents an extremely attractive target for the therapeutic
  intervention in disease caused by RNA viruses. For RNA viruses to cause
  disease, they must replicate. This process of RNA replication is depicted in
  the following diagram.

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                             RNA Virus Replication

 [The following is required for the EDGAR filing and will not appear in the
 printed report: This diagram depicts schematically the life cycle of a generic
 RNA virus. The diagram is centered with a light gray oval figure representing
 a generic cell. Overlaid on this oval figure are six arrows, numbers 1 through
 6, traversing the oval figure from the upper left to the lower right.
 Preceding the first arrow numbered "1" and outside the oval figure is a single
 virus particle depicted schematically as a 10-sided icosahedral shape. Beyond
 arrow 1, just inside the oval figure and in front of arrow "2" is an identical
 10-sided icosahedral shaped virus. Beyond arrow 2 and in front of arrow "3" is
 a vertical single helical ribbon depicting viral RNA, at the bottom of which
 are several small solid circular shapes depicting proteins attached to the
 helical ribbon. Beyond arrow 3 and in front of arrow "4" is a vertical double
 helical ribbon depicting two intertwined strands of viral RNA, at the bottom
 of which are several small solid circular shapes depicting proteins attached
 to the double helical ribbon. Beyond arrow 4 and in front of arrow "5" is a
 vertical single helical ribbon depicting viral RNA, at the bottom of which is
 a partially assembled 10-sided shape into which the ribbon appears to be
 entering and at the top of which are several small solid circular shapes
 depicting proteins attached to the helical ribbon. Beyond arrow 5 and in front
 of arrow "6" near to, but within, the lower right border of the oval cell
 figure are several identical and intact 10-sided icosahedral shaped viruses.
 Beyond arrow "6" are numerous identical 10-sided icosahedral shaped viruses
 emanating from the lower right portion of the oval cell figure and also
 outside the oval cell figure in the lower right portion of the diagram.]
 WHEN AN RNA VIRUS ENTERS A CELL (1), ITS RNA IS RELEASED FROM THE VIRUS'S 
 COAT (2), ALLOWING THE UNIQUE MULTI-STEP PROCESS OF RNA REPLICATION TO 
 PROCEED (3-4), AFTER WHICH NEW RNA VIRUS OFFSPRING ARE CREATED (5) AND
 SUBSEQUENTLY RELEASED FROM THE INFECTED CELL (6). EACH RNA VIRUS OFFSPRING THAT
 INFECTS A NEW CELL REPEATS THIS REPLICATION PROCESS.
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       Inhibiting RNA virus replication can prevent, limit or stop disease. In
  addition to thwarting disease, the direct inhibition of viral RNA uncoating
  and replication will reduce the possibility for generation of drug-resistant
  virus offspring and decrease virus transmission from infected individuals to
  healthy persons. RNA replication is a complicated process involving several
  viral proteins that must act together in a coordinated fashion. Due to the
  nature of this process, changes or mutations in these proteins are not readily
  tolerated. Consequently, viral proteins required for RNA replication are not
  only specific to the virus, they are among the least variable proteins of the
  virus. This is in contrast to the highly variable viral surface proteins
  generally involved in immune responses to virus infections. This invariability
  of the viral proteins responsible for viral RNA replication represents an
  important attribute in their selection as molecular targets for antiviral drug
  discovery and development.

      The ViroPharma Approach

       ViroPharma, based on its number of experienced RNA virologists and its
  exclusive focus on RNA virology, believes that it is a leader in RNA virology
  and RNA antiviral drug discovery and development. As a result of its focus on,
  and expertise in, RNA virus replication, unique molecular target selection and
  assay development technologies, and its development and possession of
  proprietary chemical inhibitors and its specialized chemical library, the
  Company believes that it is well-positioned to develop effective antiviral
  pharmaceuticals for RNA virus diseases.

       While the RNA replication process is common among all RNA viruses, the
  detailed molecular and biochemical mechanisms of RNA replication are currently
  not fully understood. However, the Company has used its experience in RNA
  virology, RNA virus uncoating and RNA replication, along with recent advances
  in biological, molecular and informatics technologies, to gain an
  understanding of several aspects of the RNA virus uncoating and replication
  process. Company scientists have elucidated fundamental processes involved in
  virus uncoating and used this knowledge

                                      -3-
<PAGE>
 
  to design compounds to inhibit these processes. They have also succeeded in
  discovering new virus enzyme activities that are essential to RNA replication,
  which are the subject of a U.S. patent application filed by the Company.
  Company scientists have further characterized several RNA virus replication
  activities and used the resulting information to develop novel drug screening
  assays. The Company's assays are optimized for high sensitivity and
  specificity and are validated for reproducibility. These assays are automated
  using state-of-the-art robotics technologies to facilitate the high throughput
  screening of large chemical libraries. Using its novel assays, the Company has
  discovered proprietary small molecule compounds that inhibit the targeted
  virus-specific activities. Once active compounds are identified, the Company
  advances such compounds to clinical drug candidates through a process of
  chemical optimization. This process involves the rapid generation of an
  expanded chemical analog series based on the initial active compounds and
  utilizes an array of technologies including computer-assisted pharmacophore
  modeling and drug design techniques, two-dimensional and three-dimensional
  structure and substructure chemical database searches and conventional
  medicinal chemistry, combinatorial chemistry and automated high capacity
  chemical synthetic methods. The Company then evaluates analog series in
  various biochemical and biological assays that assess compound selectivity,
  potency, safety and bioavailability. Importantly, the Company chemically
  optimizes active compounds for these four key parameters in parallel, not
  sequentially. The Company believes that its combination of chemical and
  biological technologies and parallel compound optimization process allows it
  to accelerate drug discovery and development. The generation of large numbers
  of specific chemical analogs by the Company also enables it to rapidly expand
  its valuable chemical library that is biased toward inhibitors of enzymes and
  activities essential to RNA replication. The Company believes that this
  library provides a significant advantage in its efforts to discover inhibitors
  for additional RNA virus diseases. The Company believes that the technologies
  used by the Company have never been applied to develop an approved
  pharmaceutical product.

  Strategy

       The Company's objective is to become the leading discoverer, developer
  and marketer of proprietary antiviral pharmaceuticals for RNA virus diseases.
  The Company seeks to achieve this objective through the implementation of the
  following strategies:

        .    Focus on RNA Virus Diseases. RNA viruses cause the majority of
             human viral diseases, yet few effective antiviral drugs are
             available to address these diseases. Based on the significance and
             prevalence of disease associated with RNA viruses and the limited
             means to effectively prevent or treat these diseases, the Company
             believes there is a significant market opportunity for the
             development of effective therapeutics for RNA virus diseases. The
             Company has focused its resources to capitalize on this market
             opportunity.

        .    Broadly Apply Technological Expertise in RNA Virology. The Company
             has leading expertise in RNA antiviral drug discovery, focusing on
             RNA replication and involving the selection of specific molecular
             targets and the development of novel drug screening assays,
             proprietary chemical inhibitors and a specialized chemical library.
             Since RNA replication is unique to RNA viruses, yet common to all
             RNA viruses, this process provides a broadly applicable platform
             for drug discovery. The Company intends to continue to expand and
             apply its expertise in RNA virology, RNA replication, chemical
             synthesis methodologies and antiviral drug design.

        .    Conduct Parallel Drug Discovery Assessments. The key parameters in
             the drug discovery process are selectivity, potency, safety and
             bioavailability. The Company accelerates and enhances the
             efficiency of its drug discovery programs by simultaneously
             optimizing chemical compounds for each of these parameters during
             the drug discovery process.

        .    Pursue Indications for Rapid Demonstration of Efficacy. In order to
             expedite drug development, the Company initially targets disease
             indications based upon the likelihood for rapid demonstration of
             efficacy in clinical trials. The Company then pursues follow-on
             clinical development for expanded disease indications.

                                      -4-
<PAGE>
 
        .    Pursue Strategic Relationships by Leveraging RNA Virology
             Expertise. The Company leverages its leadership position in RNA
             virus antiviral drug discovery and development through strategic
             relationships with pharmaceutical companies, specialized technology
             companies and academic institutions. With these relationships, the
             Company enhances its drug discovery capabilities and in-licensing
             opportunities and facilitates the commercialization of its
             potential products.

  Product Development and Research

       The Company has focused its current drug discovery and development
  activities on a number of RNA virus diseases including viral meningitis, hand-
  foot-and-mouth disease, "summer flu," the common cold, influenza, hepatitis C
  and viral pneumonia. The Company has drug candidates in various stages of
  research and development for each of these RNA virus diseases. The following
  chart sets forth the target disease indications and the status of the
  Company's lead product candidates:
<TABLE>
<CAPTION>
- - --------------------------------------------------------------------------------
    Disease Indication         Product Candidate        Development Status(1)
- - --------------------------------------------------------------------------------
<S>                          <C>                      <C>
Viral Meningitis             Pleconaril (oral)        Phase IIb clinical trial
                                                      commenced June 1996

Hand-Foot-and-Mouth Disease  Pleconaril (oral)        Phase II clinical trial
                                                      commenced March 1997

"Summer Flu"                 Pleconaril (oral)        Phase IIa clinical trial
                                                      completed April 1996;
                                                      Phase IIb clinical trial
                                                      anticipated late 1997

Common Cold                  Pleconaril (oral)        Phase II clinical trial
                                                      in asthmatics anticipated
                                                      in late 1997
                                          
                             Pleconaril               Preclinical; IND
                             (intranasal)             anticipated late 1997
 
Influenza                    VP 14221 series          Preclinical safety and
                                                      pharmacokinetics studies

Hepatitis C                  VP 31593 series          Chemical optimization

Viral Pneumonia              VP 36676 series          Chemical optimization

_______________
(1)  For a discussion of preclinical testing and the phases of human clinical
     trials, see "-- Government Regulation."
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</TABLE>

       The Company's most advanced product candidate, pleconaril, based on
  preclinical studies, is a potent, broad spectrum, orally active inhibitor of
  enteroviruses and rhinoviruses. Enteroviruses and rhinoviruses are closely
  related members of a large, very prevalent group of RNA viruses that are
  responsible for widespread human disease. According to the Centers for Disease
  Control (the "CDC"), there are 10 to 15 million enterovirus infections every
  year in the United States. Enteroviruses cause viral meningitis, hand-foot-
  and-mouth disease, "summer flu," myocarditis, pericarditis, encephalitis,
  herpangina, otitis media and perinatal enteroviral disease. Rhinoviruses are
  responsible for up to 50% of all acute respiratory illnesses and are the
  leading cause of the common cold.

       The Company is developing pleconaril for four indications: viral
  meningitis, hand-foot-and-mouth disease, "summer flu" and the common cold.
  While antibiotics are commonly prescribed by physicians to patients with these
  diseases, they are ineffective at treating these virus infections.
  Prescription and over-the-counter cough and cold remedies, analgesics and
  antipyretics are also used to reduce symptoms of hand-foot-and-mouth disease,
  "summer flu"

                                      -5-
<PAGE>
 
  and the common cold, but do not treat the underlying diseases. Currently,
  there are no antiviral therapies available for any of the diseases caused by
  enteroviruses or rhinoviruses. Pleconaril is not expected to be commercially
  available for at least three years, if at all.

       ViroPharma scientists have demonstrated that pleconaril inhibits
  enterovirus and rhinovirus replication by a novel, virus-specific mode of
  action. The compound binds to a specific site inside the coat protein of the
  virus, thereby preventing the release of the viral RNA inside the cell and
  blocking the initiation of the RNA replication process. In preclinical studies
  conducted by the Company, pleconaril was shown to effectively inhibit the cell
  culture replication of 96% of the rhinoviruses and enteroviruses isolated from
  332 human patients. The patient population from which these viruses were
  isolated exhibited the complete range of diseases caused by these viruses,
  including a number of fatal infections. Moreover, orally administered
  pleconaril protected mice from lethal infection by enteroviruses in three
  distinct animal model systems and was effective even when therapy was
  initiated after infection in these models. Based on these results, the Company
  believes that pleconaril will be effective against a broad spectrum of
  rhinoviruses and enteroviruses. There can be no assurance that pleconaril will
  be clinically efficacious against diseases caused by these viruses. See
  "Important Factors Regarding Forward-Looking Statements--Uncertainty Regarding
  Clinical Trials" attached in Exhibit 99 to this Annual Report on Form 10-K.

       In Phase I single ascending dose studies with a capsule formulation of
  pleconaril, plasma concentrations of drug increased proportionally to the oral
  dose administered up to the highest dose tested (1000 mg). Maximum drug plasma
  levels 20 times that required to inhibit the replication of the majority of
  the clinical virus isolates referred to above were achieved with a single 200
  mg dose. In Phase I multidose studies conducted by the Company, doses up to
  400 mg administered three times per day for seven consecutive days were well-
  tolerated by all subjects in the study. No serious adverse events attributable
  to the drug were observed in the 50 subjects who received pleconaril during
  the course of these Phase I studies. There can be no assurance that
  unacceptable toxicities or side effects will not occur during development or
  that any product will be effective or safe when administered to patients. The
  Company has developed an oral liquid formulation of pleconaril, which the
  Company has demonstrated is bioequivalent to the capsule formulation used in
  Phase I studies. The liquid formulation is self-preserving, stable and
  contains only GRAS (Generally Regarded As Safe) ingredients. This formulation
  provides considerable flexibility in dosing and is being used in clinical
  trials for the viral meningitis and hand-foot-and-mouth disease indications
  and will be used in clinical trials for the "summer flu" and common cold
  disease indications. The Company is also developing an intranasal formulation
  of pleconaril for use in the common cold indication. Currently, the Company is
  exploring delivery systems for its intranasal formulation.

       The Company has initiated a compassionate use, open-label protocol to
  provide pleconaril to patients with chronic enterovirus meningoencephalitis
  and acute enterovirus myocarditis.  Patients with chronic meningoencephalitis
  are unable to develop an antibody response to enterovirus central nervous
  system infections and suffer progressive neurological deterioration which can
  lead to seizures, paralysis and death.  Acute enteroviral myocarditis is an
  infection of the heart muscle which may eventuate in congestive heart failure.
  The Company believes that there are less than 500 patients infected with these
  viruses worldwide.

       The Company has entered into an agreement with Sanofi S.A. under which it
  has received exclusive rights to develop and market all products relating to
  pleconaril, and related compounds for use in enterovirus and rhinovirus
  disease indications in the United States and Canada, as well as a right of
  first refusal in respect of any other indications. Pleconaril was discovered
  at Sanofi by scientists now with ViroPharma. See "--Strategic Relationships--
  Sanofi S.A." and "--Patents." Pleconaril has been approved as a generic name
  for the Company's compound VP 63843 by the United States Names Council (USAN)
  and is awaiting final approval from the World Health Organization ("WHO").

      Viral Meningitis

       Infection of the central nervous system by enteroviruses can cause
  meningitis, which is characterized by a severe headache, stiffness of the neck
  or back, fever, nausea and malaise. The disease is typically severe and
  requires emergency medical care. The disease occasionally progresses to
  serious neurologic sequelae, particularly among infants

                                      -6-
<PAGE>
 
  infected before age one year. There is currently no antiviral pharmaceutical
  for viral meningitis.

       In order to establish the incidence and clinical course of enteroviral
  meningitis and assess potential clinical endpoints for future drug efficacy
  studies, the Company conducted an Adult Viral Meningitis Observational Study
  at three medical centers (the University of Colorado, the University of
  Pennsylvania and the University of Virginia) during the 1995 summer
  enterovirus season. The results of this study demonstrated the severity and
  duration of the illness. Adults presenting at emergency rooms complaining of
  severe headaches were confirmed to be enterovirus-infected by detection of
  viral RNA in their cerebrospinal fluid. Approximately 80% of these
  enterovirus-infected patients required hospitalization, with an average stay
  of four days. Patients were unable to resume full normal activities for an
  average of 16 days. All subjects received some form of analgesic (70% received
  a narcotic) for an average of seven days to manage their severe headache pain.
  From this study, the Company estimates that 500,000 Americans contract
  enteroviral meningitis annually.

       Based on the results of two Phase I studies and the Phase IIa Enterovirus
  Challenge Study described below, the Company is currently evaluating the oral
  liquid formulation of pleconaril in an international multi-center, double
  blind, placebo controlled Phase IIb trial for treatment of viral meningitis.
  The Company initiated this study at sites in the United States in June 1996
  and in Australia and South Africa in November 1996. There can be no assurance
  that this trial will be successfully completed or completed in a timely
  manner. See "Important Factors Regarding Forward-Looking Statements--Absence
  of Products; Product Development Risks," "--Dependence on Most Advanced Drug
  Candidate" and "--Uncertainty Regarding Clinical Trials" attached in Exhibit
  99 to this Annual Report on Form 10-K.

      Hand-Foot-and-Mouth Disease

       Hand-foot-and-mouth disease is a highly communicable enterovirus syndrome
  affecting all age groups, but predominantly children and adolescents.
  Following initial symptoms of fever, malaise and respiratory or abdominal
  complaints, painful ulcerative lesions develop in the mouth and on the palms
  and soles of the hands and feet.  Affected individuals may have substantial
  difficulty drinking and eating, which may necessitate hospitalization.  The
  Company initiated a placebo controlled exploratory safety and efficacy trial
  in children with hand-foot-and-mouth disease in South Africa in March 1997.
  There can be no assurance that this trial will be successfully completed or
  completed in a timely manner. See "Important Factors Regarding Forward-Looking
  Statements--Absence of Products; Product Development Risks," "--Dependence on
  Most Advanced Drug Candidate" and "--Uncertainty Regarding Clinical Trials"
  attached in Exhibit 99 to this Annual Report on Form 10-K.

      "Summer flu" (Enterovirus respiratory disease)

       "Summer flu", or enterovirus respiratory disease, is an upper respiratory
  illness caused by enteroviruses and characterized initially by a sore throat
  and cough, followed by a general influenza-like syndrome. While this disease
  occurs throughout the year, it is most prevalent in the summer. The clinical
  illness can persist for several weeks and typically results in a physician
  visit. According to the CDC, there are an estimated 10 to 15 million cases of
  enterovirus infection each year in the United States, many of which result in
  "summer flu."  There is currently no antiviral pharmaceutical for the
  treatment of "summer flu."

       During the spring of 1996, the Company conducted a Phase IIa  Enterovirus
  Challenge Study with pleconaril. In this double blind, placebo controlled
  "summer flu" disease model, the oral capsule formulation of pleconaril
  demonstrated that all disease measures were significantly reduced for the
  pleconaril treated group in "summer flu." Eight hours after the randomized
  administration of either placebo or pleconaril, 33 volunteers were infected
  with the enterovirus coxsackievirus A21.  Subjects were then administered
  either placebo or a 200 mg dose of pleconaril twice daily for seven days.
  Placebo-treated subjects developed notable cold symptoms, while pleconaril-
  treated volunteers showed pronounced and clinically significant reductions in
  disease measures, including symptoms and virus load. Assessment of clinical
  disease by five measures (subject and physician rating of disease symptoms,
  nasal mucus production, fever and virus load in nasal secretions) showed, in
  all cases, a significant reduction in the pleconaril-treated group. Depicted
  in the graph below are the results of these disease measures for both the
  placebo-treated (light bars) and pleconaril-treated (dark bars) subjects.

                                      -7-
<PAGE>
 
- - --------------------------------------------------------------------------------
                       Phase IIa Study - Disease Measure
[The following is required for the EDGAR filing and will not appear in the
 printed report: This histogram-format graph contains five two-column sets
 along the horizontal axis. The left column of each set, depicted in light
 gray, represents disease measure data for test subjects from the
 "Placebo"-treated group, the right column of each set depicted in dark gray,
 represents disease measure data for test subjects from the
 "Pleconaril"-treated group. Below the column sets are the following five
 captions: "Subject Rating", "Physician Rating", "Mucus Weight", "Fever" and
 "Virus Load". The vertical axis is indicated at "% of Subjects Exceeding
 Disease Measure Threshold" and ranges from 0% to 100%. These Disease Measure
 Thresholds are defined in the legend to the graph as follows: "Subject Rating
 Greater than or Equal to 5 (Scale: 0-10), Physician Rating Greater than or
 Equal to 10 (Scale: 0-33), Mucus Weight Greater than or Equal to 10g (Range:
 0-54g), Fever Greater than or Equal to 100 degrees F (Range: normal - 102.3
 degrees F), Virus Load Greater than or Equal to 4 log/10/ (Range: 0-6.3
 log/10/)." The values for the "Subject Rating" columns are 67% and 13% for the
 Placebo and Pleconaril groups, respectively. The values for the "Physician
 Rating" columns are 53% and 0% for the Placebo and Pleconaril groups,
 respectively. The values for the "Mucus Weight" columns are 67% and 0% for the
 Placebo and Pleconaril groups, respectively. The values for the "Fever"
 columns are 40% and 7% for the Placebo and Pleconaril groups, respectively.
 The values for the "Virus Load" columns are 93% and 13% for the Placebo and
 Pleconaril groups, respectively.]
- - --------------------------------------------------------------------------------

       The Company anticipates advancing the pleconaril oral liquid formulation
  into a Phase IIb multicenter, placebo controlled, dose ranging clinical
  efficacy trial for the "summer flu" indication in late 1997. There can be no
  assurance that this trial will be initiated, successfully completed or
  completed in a timely manner. See "Important Factors Regarding Forward-Looking
  Statements--Absence of Products; Product Development Risks," "--Dependence on
  Most Advanced Drug Candidate" and "--Uncertainty Regarding Clinical Trials"
  attached in Exhibit 99 to this Annual Report on Form 10-K.

      Common Cold

       Rhinoviruses are the leading cause of the common cold. Many people
  experience two or three colds per year with the accompanying symptoms of
  sneezing, nasal obstruction, nasal discharge, headache and general malaise.
  The median duration of illness is seven days, with symptoms persisting for two
  weeks in approximately 25% of persons. Complications associated with
  rhinovirus infections include otitis media, pneumonia and asthmatic
  exacerbations resulting in serious respiratory distress. Although there are
  cold remedies, analgesics and antipyretics that may reduce cold symptoms,
  there is no antiviral pharmaceutical to treat the common cold.

       The Company's clinical development plan for the oral and intranasal
  formulations of pleconaril contemplates initially treating patients with
  asthma and upper respiratory tract rhinovirus infections.  These individuals
  often develop a concurrent lower respiratory tract rhinovirus infection, which
  can lead to pronounced lower airway dysfunction lasting for weeks to months.
  Treatment of this patient population provides an opportunity for both
  prophylactic and therapeutic dosing. Should the product be approved for use in
  this patient population, the Company would expect to expand clinical
  development to include the general population.

       The Company plans to select a manufacturer for the intranasal formulation
  of pleconaril in 1997. The Company anticipates filing an Investigational New
  Drug ("IND") application for the intranasal formulation of pleconaril for the
  common cold indication in late 1997. There can be no assurance that these
  activities will be initiated, successfully completed or completed in a timely
  manner. See "Important Factors Regarding Forward-Looking Statements--Absence
  of Products; Product Development Risks, "--Dependence on Most Advanced Drug
  Candidate" and "--Uncertainty Regarding Clinical Trials" attached in Exhibit
  99 to this Annual Report on Form 10-K.

                                      -8-
<PAGE>
 
      Influenza

       Influenza virus is a major cause of human illness. In the United States,
  approximately 10% to 20% of the population is infected with the influenza
  virus each year. This disease is characterized by the sudden onset of
  headache, chills and a dry cough, which is rapidly followed by fever,
  significant myalgias and malaise. Fever and upper respiratory tract symptoms
  generally last for three to five days, while the cough and weakness persist
  for an additional one to two weeks. Influenza can also be fatal. According to
  the WHO, approximately 10,000 to 40,000 deaths occur each year in the United
  States as a result of influenza. The very young, elderly and
  immunocompromised, and those with medical conditions such as cardiovascular
  disease, pulmonary disease and pregnancy, are at greatest risk for serious or
  fatal complications associated with influenza virus infections. The National
  Science and Technology Council currently estimates that the direct medical
  costs due to influenza in the United States are $5 billion per year.

       Immunization for influenza has demonstrated only limited success in
  controlling the disease. Due to the highly variable nature of the influenza
  virus surface proteins, vaccines used one year are ineffective and obsolete
  the next. New vaccines with components predicted to be important in the next
  year's influenza season must be developed, manufactured and administered each
  year. Even when forecasts result in vaccines with components closely matching
  that year's actual circulating influenza virus strain, the immunity induced by
  these vaccines is incomplete and short-lived. Reinfection with the same virus
  strain or a variant strain can occur and result in disease in previously
  immunized individuals. Finally, compliance with national immunization
  campaigns has generally been insufficient to prevent epidemics.

       The Company's principal molecular target in its influenza virus program
  is the viral RNA transcriptase complex, which is required by the virus for RNA
  replication. The Company has developed a quantitative high throughput drug
  screening assay that simultaneously measures several essential virus-encoded
  replication activities. Using this assay, ViroPharma scientists have
  discovered several specific inhibitors of influenza virus replication. The
  Company has applied its chemical optimization process to establish structure-
  activity relationships for these inhibitors with respect to potency and
  selectivity. The Company's preclinical acute safety studies conducted to date
  indicate that several of its lead compounds, currently designated the VP 14221
  Series, are well tolerated and are orally bioavailable. In addition,
  ViroPharma has filed two patent applications with the PTO and one application
  in certain foreign jurisdictions related to its active influenza virus
  compounds and is preparing additional patent applications for influenza virus
  compounds. There can be no assurance that clinical trials for this compound
  series will be initiated or, if initiated, will lead to a determination that
  the compound is safe and efficacious. No assurance can be given that such
  patents will issue. See "Important Factors Regarding Forward-Looking
  Statements--Absence of Products; Product Developments Risks," "--Uncertainty
  Regarding Clinical Trials" and "--Uncertain Ability to Protect Patents and
  Proprietary Technology and Information" attached in Exhibit 99 to this Annual
  Report on Form 10-K and "--Patents."

      Hepatitis C

       HCV, first identified in 1989, is recognized as a major cause of chronic
  hepatitis worldwide. According to the CDC, there are currently approximately
  3.5 million HCV infected individuals in the United States, with 150,000 new
  cases identified each year. The WHO estimates that an additional 10 million
  individuals are infected with HCV in Europe and a total of 100 million people
  are infected worldwide. Populations in some geographic areas, such as Japan,
  Spain, Hungary, Saudi Arabia, Southern Italy and Egypt, have particularly high
  rates of infection. One study of Egyptian blood donors has shown an infection
  rate of 19.2%. Approximately 80% of HCV infected persons will develop chronic
  hepatitis, of which 20% will progress to liver cirrhosis. Chronic HCV
  infection can also lead to the development of hepatocellular carcinoma and
  liver failure.

       There is currently no vaccine for HCV. HCV is an immunologically diverse
  virus, with many naturally occurring variants in circulation. Such diversity,
  in combination with HCV's ability to change its surface proteins, may
  represent the mechanism by which the virus escapes attack by the immune system
  and establishes persistent infections.

                                      -9-
<PAGE>
 
       IFN is currently the only approved drug in the United States for
  treatment of hepatitis due to HCV. While IFN treatment has been reported to
  improve serum liver enzyme response in 20% to 40% of patients, the remainder
  do not respond to IFN treatment. For patients who do respond, a sustained
  improvement of liver function reportedly is seen in only 10% to 20% of
  patients; the majority of patients relapse upon cessation of IFN treatment.
  Thus, while IFN represents the first treatment for chronic hepatitis C, its
  effectiveness is limited and its cure rate is low. Nevertheless, the Company
  estimates the current market for IFN use in the treatment of hepatitis C to be
  over $1 billion worldwide.

       The Company focuses on key enzyme targets involved in the HCV RNA
  replication process. Company scientists have discovered several key enzyme
  activities associated with particular HCV proteins. These activities have been
  characterized and used to establish validated high throughput assays. The HCV
  RNA helicase activity represents one such target. As a result of screening
  compounds in the HCV RNA helicase assay, the Company has identified several
  active and selective compounds, currently designated the VP 31593 Series, and
  has begun chemical optimization on such compounds. Based on its RNA helicase-
  related technology, the Company has established a collaborative drug discovery
  and development agreement with Boehringer Ingelheim Pharmaceuticals, Inc.
  ("Boehringer Ingelheim"). The Company is also developing assays for additional
  HCV molecular targets. The Company has filed two patent applications related
  to the HCV inhibitor compound series, has received a Notice of Allowance from
  the PTO in respect of one of these applications and anticipates that it will
  file additional patent applications within the next year. No assurance can be
  given that such patents will issue. See "Important Factors Regarding Forward-
  Looking Statements--Dependence on Corporate Collaborations; Potential Need for
  Additional Collaborators," and "--Uncertain Ability to Protect Patents and
  Proprietary Technology and Information," attached in Exhibit 99 to this Annual
  Report on Form 10-K, "--Strategic Relationships--Boehringer Ingelheim
  Pharmaceuticals, Inc." and "--Patents."

      Viral Pneumonia

       RS virus is the major pediatric viral respiratory tract pathogen, causing
  pneumonia and bronchiolitis in infants and young children. During seasonal
  epidemics, approximately 250,000 infants contract RS virus pneumonia, and up
  to 35% are hospitalized. Of those hospitalized, mortality rates of up to 5%
  have been reported. Children with underlying conditions such as prematurity,
  congenital heart disease, bronchopulmonary dysplasia and various congenital or
  acquired immunodeficiency syndromes are at greatest risk of serious RS virus
  morbidity and mortality. RS virus is also implicated as a significant cause of
  mortality in the elderly.

       Vaccines are not currently available for prevention of RS virus disease.
  Recently, the prophylactic use of an intravenous hyperimmune globulin infusion
  was approved for RS virus disease in certain high risk infants. Ribavirin,
  administered by aerosol to minimize the drug's adverse effects, is generally
  reserved for only the most serious cases of RS virus pneumonia and
  bronchiolitis. In both cases, drug administration can be difficult and
  inconvenient in young patients.

       The Company has developed a high throughput drug screening assay for RS
  virus replication. Company scientists have discovered several inhibitory
  compounds, currently designated the VP 36676 Series, with high potency and
  selectivity in initial profiling evaluations. The Company has initiated
  chemical optimization of these compounds. There can be no assurance that such
  chemical optimization will be successfully completed or completed in a timely
  manner. See "Important Factors Regarding Forward-Looking Statements--Absence
  of Products; Product Development Risks," "--Dependence on Most Advanced Drug
  Candidate" and "--Uncertainty Regarding Clinical Trials" attached in Exhibit
  99 to this Annual Report on Form 10-K.

      Other Potential RNA Virus Disease Targets

       The Company believes that its drug discovery technologies and development
  expertise are potentially applicable to a broad range of RNA virus diseases.
  The Company also believes that certain RNA virus diseases represent immediate
  extensions of the Company's current research and development programs. In
  addition to viral meningitis, hand-foot-and-mouth disease, "summer-flu,"
  chronic meningoencephalitis and myocarditis,  enteroviruses cause a broad
  range of diseases for which the Company's most advanced drug candidate,
  pleconaril, may be effective. Of these, the

                                      -10-
<PAGE>
 
  Company is currently considering exploratory clinical trials for pleconaril
  for enterovirus neonatal sepsis. There can be no assurance that the Company
  will pursue this indication or, if the Company does pursue this indication,
  that the Company will be able to successfully demonstrate clinical efficacy .
  See "Important Factors Regarding Forward-Looking Statements--Absence of
  Products; Product Development Risks" and "--Uncertainty Regarding Clinical
  Trials" attached in Exhibit 99 to this Annual Report on Form 10-K.

       Similarly, the Company's lead anti-influenza compound series acts by a
  virus-specific mechanism that may make it potentially applicable to a large
  family of viruses called bunyaviruses. Bunyaviruses cause widespread disease
  globally including encephalitis, hemorrhagic fevers and the recently
  identified hantavirus pulmonary syndrome. In the midwestern United States
  alone, there are approximately 300,000 infections of La Crosse encephalitis
  virus annually resulting in approximately 900 deaths. In Asia and Eastern
  Europe, a bunyavirus called hantavirus is responsible for Korean hemorrhagic
  fever, a serious influenza-like illness in which approximately 33% of the
  affected individuals develop hemorrhagic disease and 5% to 10% die. In 1993,
  in the southwest United States, a new hantavirus emerged that causes
  hantavirus pulmonary syndrome, a serious respiratory disease that is fatal in
  approximately 50% of cases. This new virus has now been detected in more than
  20 states in the United States and has recently appeared in Argentina, Brazil
  and Canada.

       Assays and inhibitor compounds derived from the Company's HCV program may
  accelerate antiviral drug discovery for the related virus group called
  flaviviruses. There are 38 flaviviruses associated with human disease,
  including the dengue fever viruses, yellow fever virus and Japanese
  encephalitis virus. Importantly, the epidemiology of these diseases is
  changing. For example, with global urbanization, the incidence of dengue fever
  has increased dramatically. Dengue fever viruses typically cause a severe
  influenza-like illness and, in a more serious form, can cause a fatal
  hemorrhagic disease. Prior to 1970, only nine countries reported outbreaks of
  fatal dengue hemorrhagic fever. Presently, at least 38 countries have reported
  incidences of this serious form of dengue fever virus disease. The WHO
  estimates that there are 20 million cases of dengue fever each year, of which
  500,000 require hospitalization.

       There are currently no approved antiviral pharmaceuticals for any of the
  diseases mentioned above.

  Strategic Relationships

       ViroPharma pursues strategic relationships by leveraging its RNA virology
  expertise, while seeking to maintain independence and flexibility in the
  development and commercialization of its products. The Company has entered
  into several development and licensing agreements and research collaborations
  and continues to seek opportunities to enhance its ability to discover,
  develop and commercialize RNA antiviral drugs. There can be no assurance that
  the Company will be able to enter into additional beneficial relationships or
  maintain its current relationships.

       Currently, the Company is a party to a licensing and co-marketing
  agreement with one multinational pharmaceutical company, a drug discovery and
  development agreement with another multinational pharmaceutical company and
  several licensing and collaborative agreements with various pharmaceutical and
  technology companies and academic institutions for certain biological and
  chemical technologies. From time to time, the Company engages in discussions
  regarding additional strategic relationships. Currently, the Company does not
  have any understandings, agreements or commitments to enter into any
  additional strategic relationships.

      Sanofi S.A.

       In December 1995, the Company entered into an agreement with Sanofi S.A.
  ("Sanofi") under which it received exclusive rights to develop and market all
  products relating to pleconaril and related compounds for use in enterovirus
  and rhinovirus disease indications in the United States and Canada, as well as
  a right of first refusal in respect of any other indications. The Company's
  rights include rights to use all of Sanofi's patents, know-how and trademarks
  relating to pleconaril. The Company paid Sanofi a licensing fee of $1,000,000
  in February 1996 and is obligated to make a milestone payment of up to
  $2,000,000 upon the earlier of enrollment of the first patient in a Phase III
  trial or December 22, 1998. In addition, the Company is required to make
  milestone payments upon the achievement of certain other development
  milestones and, until the expiration of the last patent on pleconaril or any
  related drug,

                                      -11-
<PAGE>
 
  royalty payments on any sales of products developed under the agreement in the
  United States and Canada. Sanofi is required to pay the Company royalties on
  sales in all other territories of the world during the term of the agreement
  (as described below) and must reimburse certain of the milestone fees
  previously paid by the Company upon submission of pleconaril for regulatory
  approval in Japan. The Company believes that the royalty rates payable by both
  the Company and Sanofi are comparable to the rates generally payable by other
  companies under similar arrangements. See "--Patents."

       Upon the completion of data analysis from the Company's Phase II trials,
  Sanofi has the option to co-develop the drug in the European Union. If Sanofi
  chooses to co-develop, Sanofi must make certain royalty payments to the
  Company based on sales in the European Union. If Sanofi does not choose to co-
  develop, it must make royalty payments to the Company based on such sales at a
  higher royalty rate and will be required to reimburse a percentage of all
  previously paid milestone fees and reduce future milestone fees by the same
  percentage.

       The Sanofi agreement terminates on the later of the expiration of the
  last patent on pleconaril or any related drug in the United States or Canada
  or ten years following the commencement of the Company's sale of the drug in
  the United States or Canada, or earlier under certain circumstances. The term
  automatically renews for successive five year terms unless six months' prior
  written notice of termination is given by either party. Pursuant to the
  agreement, the Company is required to purchase its entire supply of pleconaril
  drug substance from Sanofi. The Company has the right to manufacture, or
  contract with third parties to manufacture, any drug product derived from the
  pleconaril drug substance. See "--Manufacturing."

      Boehringer Ingelheim Pharmaceuticals, Inc.

       In July 1996, the Company entered into a collaborative drug discovery and
  development agreement with Boehringer Ingelheim for one hepatitis C target
  identified by ViroPharma. Under this agreement, the Company granted to
  Boehringer Ingelheim the exclusive worldwide rights to develop and
  commercialize compounds discovered under the agreement. In return, Boehringer
  Ingelheim paid a technology access fee of $1,000,000 to the Company and is
  required to make research and milestone payments to the Company in connection
  with the Company's transfer of HCV screening and assay technology and at
  various stages in the development of compounds under this agreement. In
  February 1997, ViroPharma achieved its first scientific milestone under this
  agreement, for which it received a milestone payment from Boehringer
  Ingelheim.  In addition, Boehringer Ingelheim is required to make royalty
  payments to the Company on sales of products developed and marketed under this
  agreement beginning on the date a given product is first sold in a given
  country and ending on the date that the last patent covering such product in
  such country expires (or 12 years from the first sales in such country if a
  patent is never issued for such product in such country). The amounts of
  required royalty payments vary depending on which party originated the
  compound for the product. The Company believes that the royalty rates payable
  under this agreement are comparable to royalty rates generally payable by
  other companies under similar agreements. The term of the agreement is two
  years.

      Other Collaborative Agreements

       The Company is a party to collaborative drug discovery agreements with
  various pharmaceutical and technology companies, including 3-Dimensional
  Pharmaceuticals, Inc. and NPS Pharmaceuticals, Inc. Generally, under these
  agreements, the collaborators make available enabling technologies and
  compounds from their chemical libraries, and ViroPharma applies such
  technology and compounds to RNA virus diseases using the Company's proprietary
  RNA replication assays. If a successful drug is discovered, these agreements
  typically provide for good faith negotiations to establish the terms and
  conditions of a mutually acceptable collaboration agreement. Generally, any
  such resulting collaborative agreement will base the economic benefits to the
  parties upon the relative contribution by each party to a drug's discovery and
  development.

       The Company has established material transfer and licensing agreements
  and research collaborations with academic institutions and their affiliates,
  including the Academy of Sciences of the Czech Republic, Northwestern
  University, Pennsylvania State University, Renssalear Polytechnic Institute,
  the University of Florida and Washington

                                      -12-
<PAGE>
 
  University. Generally, these agreements provide for the licensing to the
  Company of materials for either (i) an initial fee and certain other fees
  payable by the Company, with no future commercial rights for the institution
  or (ii) an initial fee payable by the Company and certain rights to negotiate
  collaborative agreements for drug development and commercialization.

  Patents

       ViroPharma believes that patent protection and trade secret protection
  are important to its business and that the Company's future will depend, in
  part, on its ability to maintain its technology licenses, maintain trade
  secret protection, obtain patents and operate without infringing the
  proprietary rights of others both in the United States and abroad. The Company
  currently has filed with the PTO a patent application for technology for
  identifying inhibitors of RNA viruses, a patent application covering compounds
  active against pestivirus infection and associated RNA virus diseases, two
  patent applications covering compounds active against HCV and two patent
  applications covering compounds active against influenza viruses. The Company
  also has filed a patent application for technology for identifying inhibitors
  of RNA viruses, two patent applications covering compounds active against HCV
  and a patent application covering compounds active against influenza viruses
  in certain foreign jurisdictions. The Company has also obtained a license from
  Sanofi, which grants the Company exclusive rights under two issued United
  States patents and two related Canadian patent applications to develop,
  manufacture and market antiviral compounds in the United States and Canada.
  Pleconaril, which is currently in clinical trials, is covered by one of the
  licensed United States patents, which expires in 2012, and one of the licensed
  Canadian patent applications. The Company will be dependent on Sanofi to
  prosecute such patent applications and may be dependent on Sanofi to protect
  such patent rights. As patent applications in the United States are maintained
  in secrecy until patents issue and as publication of discoveries in the
  scientific or patent literature often lag behind the actual discoveries, the
  Company cannot be certain that it was the first to make the inventions covered
  by each of its pending patent applications or that it was the first to file
  patent applications for such inventions. Furthermore, the patent positions of
  biotechnology and pharmaceutical companies are highly uncertain and involve
  complex legal and factual questions, and, therefore, the breadth of claims
  allowed in biotechnology and pharmaceutical patents or their enforceability
  cannot be predicted. There can be no assurance that patents will issue from
  any of the Company's patent applications or, should patents issue, that the
  Company will be provided with adequate protection against potentially
  competitive products. Furthermore, there can be no assurance that should
  patents issue, they will be of commercial value to the Company, or that
  private parties, including competitors, will not successfully challenge the
  Company's patents or circumvent the Company's patent position in the United
  States or abroad. In the absence of adequate patent protection, the Company's
  business may be adversely affected by competitors who develop comparable
  technology or products. Moreover, pursuant to the terms of the Uruguay Round
  Agreements Act, patents filed on or after June 8, 1995 have a term of twenty
  years from the date of such filing, irrespective of the period of time it may
  take for such patent to ultimately issue. This may shorten the period of
  patent protection afforded to the Company's products as patent applications in
  the biopharmaceutical sector often take considerable time to issue. Under the
  Drug Price Competition and Patent Term Restoration Act of 1984, a patent which
  claims a product, use or method of manufacture covering drugs and certain
  other products may be extended for up to five years to compensate the patent
  holder for a portion of the time required for the United Stated Food and Drug
  Administration (the "FDA") review of the product. This law also establishes a
  period of time, following New Drug Application ("NDA") approval, during which
  the FDA may not accept or approve applications for certain similar or
  identical drugs from other sponsors unless those sponsors provide their own
  safety and effectiveness data. There can be no assurance that the Company will
  be able to take advantage of either the patent term extension or marketing
  exclusivity provisions of this law.

       In order to protect the confidentiality of the Company's technology,
  including trade secrets and know-how and other proprietary technical and
  business information, the Company requires all of its employees, consultants,
  advisors and collaborators to enter into confidentiality agreements that
  prohibit the use or disclosure of information that is deemed confidential. The
  agreements also oblige the Company's employees, consultants, advisors and
  collaborators to assign to the Company ideas, developments, discoveries and
  inventions made by such persons in connection with their work with the
  Company. There can be no assurance that confidentiality will be maintained or
  disclosure prevented by these agreements or that the Company's proprietary
  information or intellectual property will be protected thereby or that

                                      -13-
<PAGE>
 
  others will not independently develop substantially equivalent proprietary
  information or intellectual property.

       The pharmaceutical industry is highly competitive and patents have been
  applied for by, and issued to, other parties relating to products competitive
  with those being developed by the Company. Therefore, the Company's drug
  candidates may give rise to claims that they infringe the patents or
  proprietary rights of other parties existing now and in the future.
  Furthermore, to the extent that ViroPharma or its consultants or research
  collaborators use intellectual property owned by others in work performed for
  the Company, disputes may also arise as to the rights in such intellectual
  property or in related or resulting know-how and inventions. An adverse claim
  could subject the Company to significant liabilities to such other parties
  and/or require disputed rights to be licensed from such other parties. There
  can be no assurance that any license required under any such patents or
  proprietary rights would be made available on terms acceptable to the Company,
  if at all. If the Company does not obtain such licenses, it may encounter
  delays in product market introductions, or may find that the development,
  manufacture or sale of products requiring such licenses may be precluded. In
  addition, the Company could incur substantial costs in defending itself in
  legal proceedings instituted before the PTO or in a suit brought against it by
  a private party based on such patents or proprietary rights, or in suits by
  the Company asserting its patent or proprietary rights against another party,
  even if the outcome is not adverse to the Company. The Company has not
  conducted any searches or made any independent investigations of the existence
  of any patents or proprietary rights of other parties. See "Important Factors
  Regarding Forward-Looking Statements--Uncertain Ability to Protect Patents and
  Proprietary Technology and Information" attached in Exhibit 99 to this Annual
  Report on Form 10-K.

  Manufacturing

       The Company does not currently have manufacturing capabilities, nor does
  the Company intend to develop such capabilities for any products in the near
  future. The Company believes that internal manufacturing capabilities will not
  be necessary to successfully commercialize its products. Pleconaril drug
  substance is prepared from readily available materials using well-established
  synthetic processes. Technology involved in the production of pleconaril is
  proprietary and covered by a patent licensed to the Company by Sanofi. The
  Company has an agreement with Sanofi for the supply of pleconaril drug
  substance for clinical trials.  Sanofi is required to supply the Company's
  needs at cost during drug development and at cost plus a reasonable mark-up
  for any commercial sales in the United States and Canada.  The Company is
  obligated to purchase pleconaril drug substance exclusively from Sanofi. In
  the event that Sanofi is unable to satisfy the Company's requirements and the
  Company is required to find an additional or alternative source, there may be
  additional cost and delay in product development or commercialization.  The
  Company anticipates that its current supply of pleconaril drug substance will
  be sufficient to complete its ongoing clinical trials for viral meningitis and
  hand-foot-and-mouth disease, and its planned clinical trial for "summer flu."
  The Company may require additional quantities of pleconaril drug substance to
  complete its planned clinical trial for the common cold.  The Company believes
  that it will be able to obtain drug substance from Sanofi and, if necessary,
  other manufacturers for the production of pleconaril drug product on terms
  acceptable to the Company. The Company intends to contract third party
  manufacturers for the preparation of other compounds and drug substances and
  products for preclinical research and commercial production. See "Important
  Factors Regarding Forward-Looking Statements--Absence of Manufacturing
  Capabilities" attached in Exhibit 99 to this Annual Report on Form 10-K and "-
  -Strategic Relationships--Sanofi S.A." The Company is currently negotiating
  with several contractors for the commercial manufacture of the liquid
  formulation of pleconaril drug product. The Company has established quality
  control guidelines, which require that third party manufacturers under
  contract produce the drug product in accordance with the FDA's Good
  Manufacturing Practices ("GMP") requirements. The Company maintains
  confidentiality agreements with potential and existing manufacturers in order
  to protect its proprietary rights related to pleconaril.

  Marketing

       ViroPharma does not currently have a sales and marketing organization.
  Under its agreement with Sanofi, the Company has the right to market and sell
  pleconaril for all enterovirus and rhinovirus indications in the United States
  and Canada. Because patients with viral meningitis typically present in a
  hospital emergency room setting, the Company is contemplating establishing a
  focused sales force to service this concentrated, hospital-based market. There
  can be no

                                      -14-
<PAGE>
 
  assurance that the Company will be successful in developing a sales force,
  penetrating the markets for any proposed products or achieving market
  acceptance of its products. The success and commercialization of the Company's
  other potential products will be dependent, in part, upon the ability of the
  Company to maintain its existing arrangement with Boehringer Ingelheim, which
  governs marketing of the Company's proposed product for hepatitis C, and to
  enter into additional collaborative agreements for other potential products.
  The Company presently intends to co-market and co-promote products developed
  for hand-foot-and-mouth disease, "summer flu" and the common cold indications
  in the United States and Canada, if and when such products are approved by
  regulatory agencies. There can be no assurance that any such marketing
  arrangements will be available on terms acceptable to the Company, if at all,
  that such third parties would perform adequately their obligations as
  expected, or that any revenue would be derived from such arrangements. See
  "Important Factors Regarding Forward-Looking Statements--Absence of Marketing
  and Sales Capability" and "--No Assurance of Market Acceptance" attached in
  Exhibit 99 to this Annual Report on Form 10-K and "-- Strategic
  Relationships."

  Government Regulation

       Regulation by governmental authorities in the United States and foreign
  countries is a significant factor in the Company's ongoing research and
  product development activities and in the manufacturing and marketing of the
  Company's drug candidates. All of the Company's products will require
  regulatory approval by governmental agencies, principally the FDA, prior to
  commercialization. In particular, therapeutic products for human use are
  subject to rigorous preclinical and clinical testing and other approval
  requirements by the FDA and similar health authorities in foreign countries.
  Various federal statutes and regulations also govern or influence the
  manufacturing, safety, labeling, storage, recordkeeping and marketing of such
  products. The process of obtaining these approvals and the subsequent
  compliance with appropriate statutes and regulations require the expenditure
  of substantial resources. Any failure by the Company or its collaborators,
  licensors or licensees to obtain, or any delay in obtaining, regulatory
  approval could adversely affect the marketing of products then being developed
  by the Company and its ability to receive product or royalty revenues.

       The steps required before a new drug may be commercially distributed in
  the United States include (i) conducting appropriate preclinical laboratory
  and animal tests, (ii) submitting to the FDA an IND application which must be
  approved before clinical trials may commence, (iii) conducting controlled
  human clinical trials that establish the safety and efficacy of the drug
  product, (iv) filing an NDA with the FDA and (v) obtaining FDA approval of the
  NDA prior to any commercial sale or shipment of the drug. This process can
  take a number of years and involve the expenditure of substantial resources.
  The results of preclinical studies and initial clinical trials are not
  necessarily predictive of the results from large-scale clinical trials, and
  clinical trials may require substantial additional funds, delays or
  modifications due to, among other factors, difficulty in obtaining sufficient
  patient populations, clinicians or support. In addition to obtaining FDA
  approval for each indication to be treated with each product, each domestic
  drug manufacturing establishment must register with the FDA, list its drug
  products with the FDA, comply with GMP requirements and be subject to
  inspection by the FDA. Moreover, the submission of applications for approval
  may require additional time to complete manufacturing stability studies.
  Foreign manufacturing establishments distributing drugs in the United States
  also must comply with GMP requirements and list their products with the FDA.
  They are subject to periodic inspection by the FDA or by local authorities
  under agreement with the FDA. See "Important Factors Regarding Forward-Looking
  Statements--Government Regulation; No Assurance of Regulatory Approval"
  attached in Exhibit 99 to this Annual Report on Form 10-K.

       Upon approval in the United States, a drug may only be marketed for the
  approved indications in the approved dosage forms and dosages. The FDA also
  may require post-marketing testing and surveillance to monitor safety and
  efficacy history of the approved product and continued compliance with
  regulatory requirements. Adverse experiences with the product must be reported
  to the FDA. Product approvals may be withdrawn if compliance with regulatory
  requirements is not maintained or if problems concerning safety or efficacy of
  the product occur following approval.

       The FDA also mandates that drugs be manufactured in conformity with GMP
  regulations. In complying with the GMP regulations, manufacturers must
  continue to expend time, money and effort in production, recordkeeping and
  quality control to ensure that the product meets applicable specifications and
  other requirements. The FDA periodically inspects drug manufacturing
  facilities to ensure compliance with applicable GMP requirements. Failure to
  comply

                                      -15-
<PAGE>
 
  subjects the manufacturer to possible FDA action, such as warning letters,
  suspension of manufacturing, seizure of the product, voluntary recall of a
  product or injunctive action. The Company currently relies on, and intends to
  continue to rely on, third parties to manufacture compounds and products. Such
  third parties will be required to comply with GMP requirements.

       Even after FDA approval has been obtained, and often as a condition to
  expedited approval, further studies, including post-marketing studies, may be
  required. Results of post-marketing studies may limit or expand the further
  marketing of the products. Further, if there are any modifications to the
  drug, including changes in indication, manufacturing process, manufacturing
  facility or labeling, an NDA supplement may be required to be submitted to the
  FDA.

       Products marketed outside the United States which are manufactured in the
  United States may be subject to certain FDA regulations, as well as regulation
  by the country in which the products are to be sold. If products are marketed
  abroad, the Company will also be subject to foreign regulatory requirements
  governing clinical trials and pharmaceutical sales, which may vary from
  country to country. In connection with certain of its strategic relationships,
  the Company's collaborators may be responsible for the foreign regulatory
  approval process of the Company's drugs, although the Company may be legally
  liable for noncompliance.

       The Company is also subject to various federal, state and local laws,
  rules, regulations and policies relating to safe working conditions,
  laboratory and manufacturing practices, the experimental use of animals and
  the use and disposal of hazardous or potentially hazardous substances,
  including radioactive compounds and infectious disease agents, used in
  connection with the Company's research work. The extent of government
  regulation which might result from future legislation or administrative action
  cannot be accurately predicted. Moreover, although the Company believes that
  its safety procedures for handling and disposing of such materials comply with
  current federal, state and local laws, rules, regulations and policies, the
  risk of accidental injury or contamination from these materials cannot be
  entirely eliminated.

       Moreover, the Company anticipates that Congress, state legislatures and
  the private sector will continue to review and assess controls on health care
  spending. Any such proposed or actual changes could cause the Company or its
  collaborators to limit or eliminate spending on development projects and may
  otherwise impact the Company. Additionally, in both domestic and foreign
  markets, sales of the Company's proposed products will depend, in part, upon
  the availability of reimbursement from third-party payors, such as government
  health administration authorities, managed care providers, private health
  insurers and other organizations. Significant uncertainty often exists as to
  the reimbursement status of newly approved health care products. In addition,
  third-party payors are increasingly challenging the price and cost
  effectiveness of medical products and services. There can be no assurance that
  the Company's proposed products will be considered cost effective or that
  adequate third-party reimbursement will be available to enable the Company to
  maintain price levels sufficient to realize an appropriate return on its
  investment in product research and development. See "Important Factors
  Regarding Forward-Looking Statements--Uncertainty of Pharmaceutical Pricing
  and Related Matters; Need for Reimbursement" attached in Exhibit 99 to this
  Annual Report on Form 10-K.

  Competition

       The pharmaceutical and biopharmaceutical industries are intensely
  competitive and are characterized by rapid technological progress. Certain
  pharmaceutical and biopharmaceutical companies and academic and research
  organizations currently engage in, or have engaged in, efforts related to the
  discovery and development of new antiviral medicines. Significant levels of
  research in chemistry and biotechnology occur in universities and other
  nonprofit research institutions. These entities have become increasingly
  active in seeking patent protection and licensing revenues for their research
  results. They also compete with the Company in recruiting skilled scientific
  talent.  Many companies are developing therapies to treat viral diseases and,
  in this regard, are in competition with the Company.  The Company believes
  that its ability to compete successfully will be based on its ability to
  create and maintain scientifically advanced technology, develop proprietary
  products, attract and retain scientific personnel, obtain patent or other
  protection for

                                      -16-
<PAGE>
 
  its products, obtain required regulatory approvals and manufacture and
  successfully market its products either alone or through outside parties.
  Some of the Company's competitors have substantially greater financial,
  research and development, manufacturing, marketing and human resources and
  greater experience in drug discovery, development, clinical trial management,
  FDA regulatory review, manufacturing and marketing than ViroPharma.  Moreover,
  the Company believes that the technologies used by the Company have never been
  applied to develop an approved pharmaceutical product. See "Important Factors
  Regarding Forward-Looking Statements--Competition" and "--Rapid Technological
  Change and Uncertainty" attached in Exhibit 99 to this Annual Report on Form
  10-K.

  Human Resources

       As of February 28, 1997, ViroPharma had 37 full-time employees, including
  12 persons with Ph.D. or M.D. degrees. Twenty-nine of ViroPharma's employees
  are engaged in research and development activities at the Company's laboratory
  facility in Malvern, Pennsylvania. A significant number of the Company's
  management and professional employees have had prior experience with
  pharmaceutical, biotechnology or medical products companies. None of the
  Company's employees is covered by collective bargaining agreements. The
  Company believes that its relations with its employees are good. There can be
  no assurance that the Company will be able to continue to attract and retain
  qualified personnel, and the Company does not maintain "key man" life
  insurance on any of its employees. See "Important Factors Regarding Forward-
  Looking Statements--Dependence on Key Personnel" attached in Exhibit 99 to
  this Annual Report on Form 10-K.

  Scientific Advisory Board

       The Company has assembled a Scientific Advisory Board consisting of
  individuals with demonstrated expertise in particular fields who periodically
  advise the Company on matters relating to long-term scientific planning,
  research and development activities and technological matters. Several of the
  advisors have had previous scientific working relationships with members of
  the Company's management team.

       The members of the Company's Scientific Advisory Board are as follows:

       Hugh E. Black, D.V.M., Ph.D. is President of Hugh E. Black & Associates,
  Inc. In 1994, Dr. Black retired from Schering-Plough Research Institute where
  he served as Vice President, Drug Safety and Metabolism.  Dr. Black received
  his D.V.M. degree from the University of Toronto and his Ph.D. degree in
  veterinary pathology from Ohio State University.

       Gary L. Davis, M.D., is Professor of Medicine and the Director of the
  Hepatobiliary Diseases Section of the Gastroenterology, Hepatology, and
  Nutrition Division at the University of Florida College of Medicine in
  Gainesville. Dr. Davis received his M.D. degree from the University of
  Minnesota.

       James B. Flanegan, Ph.D., is Professor of Molecular Genetics and
  Microbiology at the University of Florida College of Medicine in Gainesville.
  Dr. Flanegan received his Ph.D. degree in biochemistry from the University of
  Michigan.

       Frederick G. Hayden, M.D., is the S. Stuart Richardson Professor of
  Clinical Virology in Internal Medicine and Professor of Internal Medicine and
  Pathology at the University of Virginia School of Medicine in Charlottesville.
  Dr. Hayden received his M.D. degree from Stanford University School of
  Medicine.

       Michael D. Hayre, D.V.M., is Director of the Laboratory Animal Research
  Center, The Rockefeller University in New York. Dr. Hayre received his D.V.M.
  degree from Tuskegee University.

       Robert A. Lamb, Ph.D., Sc.D., is the John Evans Professor of Molecular
  and Cell Biology at Northwestern University and a Howard Hughes Medical
  Institute Investigator. Dr. Lamb received his Ph.D. in virology and Sc.D.
  degree from the University of Cambridge, England.

                                      -17-
<PAGE>
 
       Charles M. Rice, Ph.D., is Professor in the Department of Molecular
  Microbiology at Washington University School of Medicine in St. Louis,
  Missouri. Dr. Rice received his Ph.D. degree in biochemistry from the
  California Institute of Technology.

        Michael G. Rossmann, Ph.D., is the Hanley Professor of Biological
  Sciences at Purdue University in West Lafayette, Indiana. Dr. Rossmann
  received his Ph.D. degree in chemical crystallography from the University of
  Glasgow.

       Harley A. Rotbart, M.D. is Professor in the Departments of Pediatrics and
  Microbiology at the University of Colorado Health Science Center in Denver.
  Dr. Rotbart received his M.D. degree from Cornell University Medical College.

       Richard Whitley, M.D., is the Loeb Eminent Scholar and Professor of
  Pediatrics, Microbiology and Medicine at University of Alabama at Birmingham.
  Dr. Whitley received his M.D. degree from George Washington University School
  of Medicine.

       Members of the Scientific Advisory Board receive consulting fees for
  their services. In addition, to date, the Company has granted an aggregate of
  66,300 options to members of the Scientific Advisory Board, of which 2,550
  have been exercised.

  ITEM 2.   PROPERTIES

       The Company's principal facility consists of approximately 17,000 square
  feet of leased laboratory and office space in Malvern, Pennsylvania.  The
  lease expires in October 1998.  The Company believes its present facilities
  will be adequate for operations through 1998.  The Company is currently
  negotiating with several third parties for laboratory and office space and
  believes it can obtain adequate laboratory and office space on acceptable
  terms in the Malvern area.

  ITEM 3.   LEGAL PROCEEDINGS

       None.

  ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

       Pursuant to a written Consent of Holders of Preferred Stock and a written
  Consent of Holders of Common Stock, each dated November 5, 1996, the
  stockholders of the Company approved a .51 for 1 reverse stock split of the
  Company's Common Stock, adopted the Company's Second Amended and Restated
  Certificate of Incorporation, and confirmed the number of authorized shares of
  Common Stock and the number of shares of Common Stock issuable under the
  Company's 1995 Stock Option Plan.  On a pre-split basis, the holders of
  8,280,497 shares of Preferred Stock (out of a total of 10,957,222 shares) and
  the holders of 1,625,000 shares of Common Stock (out of a total of 1,767,000
  shares) approved the foregoing actions.  The remaining stockholders of the
  Company were notified of these actions as required by Section 228(d) of the
  Delaware General Corporation Law.

                                      -18-
<PAGE>
 
  Executive Officers of the Registrant

       The executive officers of the Company and their respective ages and
  positions with the Company are as follows:
<TABLE>
<CAPTION>
 
        Name                 Age               Position
        ----                 ---               -------- 
<S>                          <C>  <C>
Claude H. Nash, Ph.D.......   54  Chief Executive Officer, President and
                                  Chairman of the Board of Directors
Mark A. McKinlay, Ph.D.....   45  Vice President, Research & Development
Marc S. Collett, Ph.D......   45  Vice President, Discovery Research
Johanna A. Griffin, Ph.D...   52  Vice President, Business Development
Guy D. Diana, Ph.D.........   61  Vice President, Chemistry Research
Jon M. Rogers, M.D.........   45  Vice President, Clinical Research
Vincent J. Milano..........   33  Vice President, Finance & Administration and Treasurer
Thomas F. Doyle............   36  Executive Director, Counsel and Secretary
</TABLE>

       Claude H. Nash, Ph.D., a co-founder of the Company, has served as
  Chairman of the Board of Directors since February 1997, and as Chief Executive
  Officer, President and director since the Company's commencement of operations
  in December 1994.  From 1983 until 1994, Dr. Nash served as Vice President,
  Infectious Disease and Tumor Biology at Schering-Plough Research Institute,
  where he was responsible for discovery research strategy and advancing new
  compounds into clinical development.  Dr. Nash received his Ph.D. from
  Colorado State University.

       Mark A. McKinlay, Ph.D., a co-founder of the Company, has served as Vice
  President, Research & Development since the Company's commencement of
  operations in December 1994, and served as Secretary from December 1994 until
  February 1997.  From 1989 through 1994, Dr. McKinlay served in several
  positions, including Senior Director, at Sterling Winthrop Pharmaceuticals
  Research Division, where he was responsible for developing strategy and
  implementing plans for the development of several compounds.  Dr. McKinlay
  received his Ph.D. from Rensselear Polytechnic Institute.

       Marc S. Collett, Ph.D., a co-founder of the Company, has served as Vice
  President, Discovery Research of the Company since the Company's commencement
  of operations in December 1994.  From 1993 until he co-founded the Company, he
  served as Senior Director, Viral Therapeutics at PathoGenesis Corporation,
  where, among other things, he established an anti-viral discovery program.
  Prior to joining PathoGenesis Corporation, Dr. Collett served as Director,
  Virology & Antibody Engineering and Director, Biochemical Virology at
  MedImmune, Inc., where he was employed from 1988 to 1993.  Dr. Collett
  received his Ph.D. from the University of Michigan.

       Johanna A. Griffin, Ph.D., a co-founder of the Company, has served as
  Vice President, Business Development since June 1995 and, from the Company's
  commencement of operations in December 1994 until June 1995, served as
  Executive Director, Business Development.  From 1990 until she joined the
  Company, Dr. Griffin served as Director of Molecular Biology at Boehringer
  Ingelheim Pharmaceuticals, Inc. where she participated in the clinical
  development of antiviral drugs and the promotion of international
  pharmaceutical and biotechnology relationships.   Dr. Griffin received her
  Ph.D. from the University of Alabama at Birmingham.

                                      -19-
<PAGE>
 
       Guy D. Diana, Ph.D., a co-founder of the Company, has served as Vice
  President, Chemistry Research since June 1995 and, from the Company's
  commencement of operations in December 1994 until June 1995, as Executive
  Director, Chemistry Research.  Prior to joining ViroPharma, he worked at
  Sterling Winthrop for 33 years, most recently as a Senior Fellow in Medicinal
  Chemistry, where he participated in the design and synthesis of antiviral
  agents and led the team that discovered pleconaril.  Dr. Diana received his
  Ph.D. from Rice University.

       Jon M. Rogers, M.D., has served as Vice President, Clinical Research
  since joining ViroPharma in June 1996. From February 1995 until he joined the
  Company, Dr. Rogers was Vice President of Medical and Scientific Affairs for
  the pharmaceuticals and diagnostics divisions of Boehringer Mannheim
  Corporation, where his responsibilities included the development of
  pharmaceuticals and diagnostics products.  From August 1989 through February
  1995, Dr. Rogers served in various positions at Sterling Winthrop, the latest
  being Senior Director of Clinical Research.  At Sterling Winthrop, Dr. Rogers
  was responsible for the development of cardiovascular, central nervous system,
  pulmonary and antithrombotic pharmaceutical products.  Dr. Rogers received his
  M.D. from the University of Cincinnati College of Medicine.

       Vincent J. Milano has served as Vice President, Finance & Administration
  of the Company since February 1997, as Treasurer since July 1996, and as
  Executive Director, Finance & Administration from joining ViroPharma in April
  1996 until February 1997.  From 1985 until he joined the Company, Mr. Milano
  was with KPMG Peat Marwick LLP, where he was Senior Manager since 1991. At
  KPMG Peat Marwick LLP, Mr. Milano specialized in public offerings and other
  Securities and Exchange Commission filings, strategic alliances and mergers
  and acquisitions, principally for life sciences companies.  Mr. Milano is a
  Certified Public Accountant. Mr. Milano received his B.S. in accounting from
  Rider College.

       Thomas F. Doyle has served as Secretary since February 1997 and as
  Executive Director, Counsel since joining the Company in November 1996.  From
  1990 until he joined the Company, Mr. Doyle was a corporate attorney with the
  law firm of Pepper, Hamilton & Scheetz, where he specialized in intellectual
  property, venture capital financing and strategic alliances for technology
  based companies.  Mr. Doyle received his J.D. from Temple University School of
  Law. Prior to attending Temple University, Mr. Doyle was a Certified Public
  Accountant.  Mr. Doyle received his B.S. in accounting from Mt. St. Mary's
  College.

                                      -20-
<PAGE>
 
                                    PART II

  ITEM 5.   MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED
            STOCKHOLDER MATTERS

  Market Information

       The Company's Common Stock is traded on the National Market segment of
  The Nasdaq Stock Market under the symbol "VPHM."  The Company commenced
  trading on The Nasdaq Stock Market on November 19, 1996.  The following table
  sets forth the high and low sale prices as quoted on The Nasdaq Stock Market.
<TABLE>
<CAPTION>
 
                                                        High       Low
 
       <S>                                             <C>        <C>
       Fourth Quarter, 1996 ........................   $ 8.75     $ 7.00

       January 1, 1997 through February 28, 1997 ...   $13.50     $9.375
</TABLE>

  Holders and Dividends

       There were approximately forty-two record-holders of the Company's Common
  Stock as of February 28, 1997. The Company has not declared or paid cash
  dividends on its Common Stock since its inception and does not intend to do so
  in the foreseeable future.  See "Management's Discussion and Analysis of
  Financial Condition and Results of Operation" in Item 7 of this Annual Report
  on Form 10-K.

  Recent Sales of Unregistered Securities

       In May 1996, the Company sold 3,222,222 shares of Series C Convertible
  Preferred Stock for an aggregate of $7,249,999.50, or $2.25 per share, to
  private investors and the executive officers of the Company.  All such shares
  of Series C Convertible Preferred Stock converted into an aggregate of
  1,643,333 shares of Common Stock upon the closing of the Company's initial
  public offering on November 22, 1996.

       Options to purchase 21,420 shares of Common Stock were exercised during
  1996.  Pursuant to a right granted in December 1994, Dr. Frank Baldino, Jr., a
  director of the Company, purchased 51,000 shares of Common Stock in January
  1996.

                                     -21-
<PAGE>
 
  ITEM 6.  SELECTED FINANCIAL DATA

       The selected financial data presented below under the caption "Balance
  Sheet Data" as of December 31, 1994, 1995 and 1996, and under the caption
  "Statement of Operations Data" for the period from December 5, 1994
  (inception) through December 31, 1994 and the years ended December 31, 1995
  and December 31, 1996 are derived from financial statements of the Company
  which have been audited by KPMG Peat Marwick LLP, independent certified public
  accountants.  The data set forth below should be read in conjunction with
  Management's Discussion and Analysis of Financial Condition and Results of
  Operations, the Financial Statements and the Notes thereto and the other
  financial information included elsewhere in this Report.  The Company is
  considered a "development stage company" as described in Note 1 of the
  Company's Financial Statements.
<TABLE>
<CAPTION>
                                  Period from
                                  December 5,
                                      1994
                                  (inception)
                                    through         Year Ended         Year Ended
                                  December 31,      December 31,       December 31,
                                      1994            1995               1996
                                  ------------     --------------      ------------
     <S>                          <C>           <C>                <C>
     Statement of Operations
      Data:                                                                         
     License fee.................          --                 --        $ 1,000,000
     Grant revenue............... $        --        $    90,813            436,081
                                  -----------        -----------        -----------
     Total revenues..............          --             90,813          1,436,081
                                  -----------        -----------        -----------

     Operating expenses:
     Research and development....      75,779          2,930,106          6,694,703
     General and administrative..     243,318          1,091,299          1,421,524
                                  -----------        -----------        -----------
     Total operating expenses....     319,097          4,021,405          8,116,227

     Interest income, net........          --             75,730            285,142
                                  -----------        -----------        -----------
     Net loss.................... $  (319,097)       $(3,854,862)       $(6,395,004)
                                  ===========        ===========        ===========
 
     Pro forma net loss per
      share(1)...................                    $      (.98)       $      (.93)
     Shares used in computing
      pro forma net loss per
      share(1)...................                      3,931,743          6,839,674

<CAPTION> 

                                                    December 31,
                                  -------------------------------------------------
                                      1994               1995               1996
                                  ------------     --------------      ------------
     <S>                          <C>              <C>                 <C> 
     Balance Sheet Data:
     Cash, cash equivalents and                                                     
      short-term investments.....   $  22,870        $ 4,713,426        $22,547,679
     Working capital (deficit)...    (243,172)         3,270,375         20,001,703
     Total assets................      24,870          4,873,845         23,452,879
     Long-term capital leases....          --                 --            104,571
     Mandatorily redeemable
      convertible preferred
      stock......................      60,000          7,416,604                 --
     Total stockholders' equity
      (deficit)..................    (303,172)        (4,089,758)        20,605,161
</TABLE>
- - ----------------
(1) See Note 2 of Notes to Financial Statements.

                                     -22-
<PAGE>
 
  ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
           RESULTS OF OPERATIONS

       This discussion contains forward-looking statements which involve risks
  and uncertainties.  The Company's actual results may differ significantly from
  the results discussed in forward-looking statements.  Factors that might cause
  or contribute to such differences include, but are not limited to, those
  discussed in "Important Factors Regarding Forward-Looking Statements" attached
  hereto as Exhibit 99.

       Since inception, the Company has devoted substantially all of its
  resources to its research and product development programs.  ViroPharma has
  generated no revenues from product sales and has been dependent upon funding
  primarily from equity financing.  The Company does not expect any revenues
  from product sales for at least the next three year period.  The Company has
  not been profitable since inception and has incurred a cumulative net loss of
  $10,568,963 through December 31, 1996.  Losses have resulted principally from
  costs incurred in research and development activities and general and
  administrative expenses.  The Company expects to incur additional operating
  losses over at least the next several years.  The Company expects such losses
  to increase over historical levels as the Company's research and development
  expenses increase due to further clinical trials and preclinical development
  of the Company's most advanced drug candidate, pleconaril, and further
  research and development related to other product candidates.  The Company's
  ability to achieve profitability is dependent on developing and obtaining
  regulatory approvals for its product candidates, successfully commercializing
  such product candidates, which may include entering into collaborative
  agreements for product development and commercialization, and securing
  contract manufacturing services.

  Results of Operations

  Years ended December 31, 1996 and 1995

       The Company received a non-refundable technology access fee of $1,000,000
  from Boehringer Ingelheim and earned $436,081 of grant revenue for the year
  ended December 31, 1996.  The Company earned $90,813 in grant revenues during
  the year ended December 31, 1995.  Net interest income increased to $285,142
  for the year ended December 31, 1996 from $75,730 for the year ended December
  31, 1995, principally due to larger invested balances provided by the proceeds
  of the Company's initial public offering.

       Research and development expenses increased to $6,694,703 for the year
  ended December 31, 1996 from $2,930,106 for the year ended December 31, 1995.
  The increase was principally due to clinical trials related to pleconaril, a
  milestone payable to Sanofi and the advancement of drug candidates for the
  Company's influenza, hepatitis C and viral pneumonia programs.

       General and administrative expenses increased to $1,421,524 for the year
  ended December 31, 1996 from $1,091,299 for the year ended December 31, 1995.
  The increase was principally due to increased salary expenses and facilities
  costs, as well as to increased costs associated with the pursuit of corporate
  collaborations.

       The net loss increased to $6,395,004 for the year ended December 31, 1996
  from $3,854,862 for the year ended December 31, 1995.

  Year ended December 31, 1995 and period ended December 31, 1994

       The Company commenced operations on December 5, 1994.  Therefore, the
  period ended December 31, 1994 was 26 days long.  Comparisons between such
  period and the complete year 1995 may not be meaningful.

       Grant revenue for the year ended December 31, 1995 was $90,813. The
  Company earned no revenues for the period ended December 31, 1994.  Interest
  income aggregated $75,730 in 1995. There was no interest income in 1994.

                                     -23-
<PAGE>
 
       Research and development expenses increased to $2,930,106 for the year
  ended December 31, 1995 from $75,779 for the period ended December 31, 1994.
  The increase was due to 12 months of expenses being reflected in 1995, a
  milestone payable to Sanofi, expenses related to the commencement of clinical
  development of pleconaril and increased spending related to the Company's drug
  discovery efforts.

       General and administrative expenses increased to $1,091,299 for the year
  ended December 31, 1995 from $243,318 for the period ended December 31, 1994.
  The increase was due to 12 months of expenses being reflected in 1995, as well
  as to increased salary costs, facilities costs and costs associated with the
  pursuit of corporate collaborations.

       Net loss for the year ended December 31, 1995 was $3,854,862. Net loss
  for the period ended December 31, 1994 was $319,097.

  Liquidity and Capital Resources

       The Company commenced operations in December 1994. The Company is a
  development stage company and to date has not generated revenues from product
  sales.  The cash flows used in operations are for research and development
  activities and the supporting general and administrative expenses.  Through
  December 31, 1996, the Company has used approximately $7.8 million in
  operating activities.  The Company invests its cash in short-term investments.
  Through December 31, 1996, the Company has used approximately $12.4 million in
  investing activities, primarily for short-term investments.  Through December
  31, 1996, the Company has financed its operations primarily through an initial
  public offering of Common Stock and  private placements of redeemable
  preferred stock and Common Stock totaling approximately $32.7 million. At
  December 31, 1996, the Company had cash and cash equivalents and short-term
  investments aggregating approximately $22.5 million.

       The Company leases its corporate and research and development facilities
  under an operating lease expiring in 1998. The Company is currently
  negotiating with several third parties for laboratory and office space and
  believes that it can secure adequate facilities on terms acceptable to the
  Company after the current operating lease expires. The Company has financed
  substantially all of its equipment under two master lease agreements and one
  bank loan. The bank loan, which was consummated in February 1997, is for
  $600,000, is payable in equal annual installments over 72 months and bears
  interest at approximately 9%. The Company is required to repay amounts
  outstanding under the two leases within periods ranging from 32 to 48 months.
  As of February 28, 1997, outstanding borrowings under these arrangements are
  approximately $1.7 million. The Company is required to make a milestone
  payment to Sanofi of up to $2 million upon the earlier of a future milestone
  event as defined in the agreement with Sanofi or December 1998. In addition,
  the Company would also be required to make certain significant additional
  payments, including royalties, as defined, should agreed-upon future
  milestones be attained.

       The Company has incurred losses from its operations since inception.  The
  Company expects to incur additional operating losses over at least the next
  several years.  The Company expects such losses to increase over historical
  levels as the Company's research and development expenses increase due to
  further clinical trials and preclinical development of the Company's most
  advanced drug candidate, pleconaril, and further research and development
  related to other product candidates.  The Company will require additional
  financing for operations and expansion of its facilities prior to achieving
  positive cash flows from its commercial activities.  The Company  expects that
  it will need additional financing to complete all clinical studies for
  pleconaril and other development and required testing for any other of the
  Company's product candidates.  To obtain this financing, the Company may seek
  to access the public or private equity markets or enter into additional
  arrangements with corporate collaborators.  To the extent the Company raises
  additional capital by issuing equity securities, ownership dilution to
  existing stockholders may result.  There can be no assurance, however, that
  additional financing will be available on acceptable terms from any source.

                                     -24- 
<PAGE>
 
  ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

       The financial statements of the Company required by this item are
  attached to this Report beginning on page F-1.

  ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
           FINANCIAL DISCLOSURE

       None.


                                    PART III

  ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

       The information concerning the Company's directors and regarding
  compliance with Section 16 of the Securities Exchange Act of 1934 required by
  this Item will be set forth in the Company's definitive Proxy Statement, to be
  filed within 120 days after the end of the fiscal year covered by this Annual
  Report on Form 10-K, and is incorporated by reference to the Company's Proxy
  Statement.

       The information concerning the Company's executive officers required by
  this Item is incorporated by reference herein to the section of this Report in
  Part I, Item 4 entitled "Executive Officers of the Registrant."


  ITEM 11.  EXECUTIVE COMPENSATION

       The information required by this Item will be set forth in the Company's
  definitive Proxy Statement, to be filed within 120 days after the end of the
  fiscal year covered by this Annual Report on Form 10-K, and is incorporated by
  reference to the Company's Proxy Statement.


  ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

       The information required by this Item will be set forth in the Company's
  definitive Proxy Statement, to be filed within 120 days after the end of the
  fiscal year covered by this Annual Report on Form 10-K, and is incorporated by
  reference to the Company's Proxy Statement.


  ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

       The information required by this Item will be set forth in the Company's
  definitive Proxy Statement, to be filed within 120 days after the end of the
  fiscal year covered by this Annual Report on Form 10-K, and is incorporated by
  reference to the Company's Proxy Statement.

                                     -25-
<PAGE>
 
                                    PART IV


  ITEM 14.       EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

       (a)     List of documents filed as part of this report:

                 (1) Financial Statements. The Financial Statements listed in
                     --------------------
  the accompanying Index to Financial Statements appearing on page F-1 are filed
  as part of this annual report on Form 10-K.

                 (2) Financial Statement Schedules.  All schedules are omitted
                     -----------------------------                            
  because they are not applicable, or not required, or because the required
  information is included in the Financial Statements or notes thereto.

                 (3) Exhibits. The following is a list of Exhibits filed as part
                     --------
  of this annual report on Form 10-K. Where so indicated by footnote, Exhibits
  which were previously filed are incorporated by reference. For Exhibits
  incorporated by reference, the location of the Exhibit in the previous filing
  is indicated in parentheses.

    Exhibit No.      Description
    -----------      -----------

       3.1           Second Amended and Restated Certificate of Incorporation of
                     the Company.(1) (Exhibit 3.1)

       3.2           By-Laws of the Company, as amended.(1) (Exhibit 3.2)

       10.1++        1995 Stock Option Plan.(1) (Exhibit 10.1)

       10.2++        ViroPharma 401(k) Employee Savings Plan, effective July
                     1, 1995. (1) (Exhibit 10.2)

       10.3          Lease dated September 19, 1995 between the Company and
                     Centocor Property Management Corp. (1) (Exhibit 10.3)

       10.4          Master Lease Agreement dated September 13, 1995 between the
                     Company and Comdisco, Inc. (1) (Exhibit 10.4)

       10.5          Master Equipment Lease No. 053-0005 dated December 1, 1995
                     between the Company and Phoenix Leasing Incorporated. (1)
                     (Exhibit 10.5)

       10.6+         Agreement dated December 22, 1995 between the Company and
                     Sanofi. (1) (Exhibit 10.6)

       10.7+         Collaborative Research Agreement dated as of July 23, 1996
                     between the Company and Boehringer Ingelheim
                     Pharmaceuticals, Inc. (1) (Exhibit 10.7)

       10.8          Form of Employment Agreement. (1) (Exhibit 10.8)

       10.9          Form of Indemnification Agreement. (1) (Exhibit 10.9)

       10.10         Form of Employee Stock Purchase Agreement. (1) 
                     (Exhibit 10.10)

                                     -26-
<PAGE>
 
       10.11         Restricted Stock Purchase Agreement dated as of January 17,
                     1996, by and between the Company and Frank Baldino, Jr. (1)
                     (Exhibit 10.11)

       10.12         Series B Convertible Preferred Stock Purchase Agreement
                     dated as of June 16, 1995 among the Company and each of the
                     entities on the "Schedule of Purchasers" attached thereto
                     as Schedule A. (1) (Exhibit 10.12)

       10.13         Series C Convertible Preferred Stock Purchase Agreement
                     dated as of May 30, 1996 among the Company and each of the
                     individuals and entities on the "Schedule of Purchasers"
                     attached thereto as Schedule A. (1) (Exhibit 10.13)

       10.14         Form of Warrants to Purchase Series B Preferred Stock dated
                     March 3, 1995 and May 12, 1995. (1) (Exhibit 10.14)

       10.15         Warrant Agreement dated as of September 13, 1995 between
                     the Company and Comdisco, Inc. (1) (Exhibit 10.15)

       10.16         Amended and Restated Investors' Rights Agreement, dated as
                     of May 30, 1996, by and among the Company and the persons
                     identified on Schedule A, Schedule B and the Schedule of
                     Founders thereto. (1) (Exhibit 10.16)

       10.17         Form of Amendment to Employee Stock Purchase Agreement. (1)
                     (Exhibit 10.17)

       10.18         Amendment to Restricted Stock Purchase Agreement dated as
                     of January 17, 1996, among the Company and Frank Baldino,
                     Jr., dated as of January 17, 1996. (1) (Exhibit 10.18)

       24*           Power of Attorney (included on signature page).

       27*           Financial Data Schedule.

       99*           Important Factors Regarding Forward-Looking Statements.
  _______________
  *    Filed herewith.

  +    Portions of this exhibit were omitted and filed separately with the
       Secretary of the Commission pursuant to an application for confidential
       treatment filed with the Commission pursuant to Rule 406 under the
       Securities Act of 1933, as amended.

  ++   Compensation plans and arrangements for executives and others. 

(1)    Filed as an Exhibit to Registration Statement on Form S-1 (File No. 333-
       12407), as amended, initially filed on September 20, 1996.

       Copies of the exhibits are available to stockholders from Thomas F.
       Doyle, Executive Director, Counsel and Secretary, ViroPharma
       Incorporated, 76 Great Valley Parkway, Malvern, Pennsylvania 19355. There
       will be a fee to cover the Company's expenses in furnishing the exhibits.

       (b)    Reports on Form 8-K

  There were no reports on Form 8-K filed by the Company for the quarter ended
  December 31, 1996.

                                     -27-
<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.


                                      VIROPHARMA INCORPORATED



                                      By:/s/ Vincent J. Milano
                                         ---------------------------------------
                                      Vincent J. Milano
                                      Vice President, Finance and Administration
                                      and Treasurer
<PAGE>
 
                               POWER OF ATTORNEY

       KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
  appears below constitutes and appoints each of Claude H. Nash and Vincent J.
  Milano as his or her attorney-in-fact, with the full power of substitution,
  for him or her in any and all capacities, to sign any amendments to this
  Report, and to file the same, with exhibits thereto and other documents in
  connection therewith, with the Securities and Exchange Commission, hereby
  ratifying and confirming all that said attorney-in-fact, or his substitute or
  substitutes, may do or cause to be done by virtue hereof.

       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>
 
Name                         Capacity                      Date
- - ----                         --------                      ----
<S>                          <C>                           <C>
                            
/s/Claude H. Nash             President, Chief Executive   March 7, 1997
- - ----------------------------  Officer and Chairman of the 
Claude H. Nash                Board (Principal Executive  
                              Officer)                    
                                                          
/s/Vincent J. Milano          Vice President, Finance and  March 7, 1997
- - ----------------------------  Administration (Principal   
Vincent J. Milano             Financial and Accounting    
                              Officer)                    
                                                          
/s/Claude H. Nash             Director                     March 7, 1997
- - ----------------------------                              
Claude H. Nash                                            
                                                          
/s/Frank Baldino, Jr., Ph.D.  Director                     March 7, 1997
- - ----------------------------                              
Frank Baldino, Jr., Ph.D.                                 
                                                          
/s/Steve Dow                  Director                     March 7, 1997
- - ----------------------------                              
Steve Dow                                                 
                                                          
/s/Jon N. Gilbert             Director                     March 7, 1997
- - ----------------------------                              
Jon N. Gilbert                                            
                                                          
/s/Ann H. Lamont              Director                     March 7, 1997
- - ----------------------------                              
Ann H. Lamont                                             
                                                          
/s/Christopher Moller, Ph.D.  Director                     March 7, 1997
- - ----------------------------                              
Christopher Moller, Ph.D.                                 
                                                          
/s/David I. Scheer            Director                     March 7, 1997
- - ----------------------------
David I. Scheer
</TABLE>
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                             Financial Statements

                          December 31, 1995 and 1996

                  (With Independent Auditors' Report Thereon)
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)


                         Index to Financial Statements

<TABLE> 
<CAPTION> 
                                                                                         Page
                                                                                         ----
<S>                                                                                      <C> 
Independent Auditors' Report                                                              F-2

Financial Statements:
     Balance Sheets at December 31, 1995 and 1996                                         F-3


     Statements of Operations for the period December 5, 1994 (inception) to
          December 31, 1994, the years ended December 31, 1995 and 1996 and the
          period December 5, 1994 (inception) to December 31, 1996                        F-4


     Statements of Stockholders' Equity (Deficit) for the period December 5,
          1994 (inception) to December 31, 1994 and the years ended December 31,
          1995 and 1996                                                                   F-5

                                                                                          
     Statements of Cash Flows for the period December 5, 1994 (inception) to
          December 31, 1994, the years ended December 31, 1995 and 1996 and the
          period December 5, 1994 (inception) to December 31, 1996                        F-6

     Notes to Financial Statements                                                        F-7
</TABLE> 

                                      F-1
<PAGE>
 
                         Independent Auditors' Report

The Stockholders and Board of Directors
ViroPharma Incorporated:

We have audited the accompanying balance sheets of ViroPharma Incorporated (A
Development Stage Company) as of December 31, 1995 and 1996, and the related
statements of operations, stockholders' equity (deficit) and cash flows for the
period from December 5, 1994 (inception) to December 31, 1994 and the years
ended December 31, 1995 and 1996, and for the period December 5, 1994
(inception) to December 31, 1996. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these 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 financial statements referred to above present fairly, in
all material respects, the financial position of ViroPharma Incorporated (A
Development Stage Company) as of December 31, 1995 and 1996, and the results of
its operations and its cash flows for the period from December 5, 1994
(inception) to December 31, 1994 and the years ended December 31, 1995 and 1996,
and for the period December 5, 1994 (inception) to December 31, 1996, in
conformity with generally accepted accounting principles.




                                                           KPMG Peat Marwick LLP


Philadelphia, Pennsylvania
February 28, 1997

                                      F-2
<PAGE>
 
                            ViroPharma Incorporated

                         (A Development Stage Company)

                                Balance Sheets
                          December 31, 1995 and 1996

<TABLE> 
<CAPTION> 

                                                  Assets                                          1995                 1996
                                                                                                  ----                 ----
<S>                                                                                    <C>                         <C> 
Current assets:
      Cash and cash equivalents                                                        $            337,044            10,810,310
      Short-term investments                                                                      4,376,382            11,737,369
      Other current assets                                                                          103,948               197,171
                                                                                                 ----------          ------------
                 Total current assets                                                             4,817,374            22,744,850
Equipment and leasehold improvements, net                                                                 -               672,029
Other assets                                                                                         56,471                36,000
                                                                                                -----------          ------------
                 Total assets                                                          $          4,873,845            23,452,879
                                                                                                ===========          ============

                              Liabilities and Stockholders' Equity (Deficit)

Current liabilities:
      Accounts payable                                                                              310,560               356,171
      Notes payable                                                                                  37,500                     -
      Obligation under capital lease - current                                                            -                52,950
      Accrued expenses and other current liabilities                                              1,198,939             2,334,026
                                                                                                -----------          ------------
                 Total current liabilities                                                        1,546,999             2,743,147
Obligation under capital lease - noncurrent                                                               -               104,571
                                                                                                -----------          ------------
                                                                                                  1,546,999             2,847,718
                                                                                                -----------          ------------
Mandatorily redeemable convertible preferred stock, par value $.001 per share
      (at redemption value which includes accretion of $19,104 at December 31,
      1995); issuable in Series A, B and C. Authorized 10,315,000 shares in 1995
      and none in 1996; issued and outstanding 7,735,000 shares in 1995 and none
      in 1996; converted into 5,588,191 common shares upon consummation of
      initial public offering in 1996                                                             7,416,604                     -
                                                                                                -----------          ------------
Stockholders' equity (deficit):
      Preferred stock, par value $.001 per share.  Authorized 5,000,000 shares 
          in 1996; none outstanding                                                                       -                     -
      Common stock, par value $.002 per share. Authorized 12,790,000 shares in
          1995 and 27,000,000 shares in 1996; issued and outstanding 828,750
          shares at December 31, 1995 and 9,076,861 at December 31, 1996                              1,657                18,154
      Additional paid-in capital                                                                    103,577            31,758,996
      Deferred compensation                                                                         (47,775)             (661,337)
      Unrealized gains on available for sales securities                                             26,742                58,311
      Deficit accumulated during the development stage                                           (4,173,959)          (10,568,963)
                                                                                                -----------          ------------ 
                 Total stockholders' equity (deficit)                                            (4,089,758)           20,605,161
Commitments.                                                                                    -----------          ------------
                 Total liabilities and stockholders' equity
                      (deficit)                                                        $          4,873,845            23,452,879
                                                                                                ===========          ============ 
</TABLE> 

See accompanying notes to financial statements.

                                      F-3
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                           Statements of Operations

           Period December 5, 1994 (inception) to December 31, 1994,
          the years ended December 31, 1995 and 1996, and the period
               December 5, 1994 (inception) to December 31, 1996

<TABLE> 
<CAPTION> 
                                                                                                                           
                                                                                                              Period       
                                                       December 5,                                          December 5,    
                                                          1994                   Year ended                    1994        
                                                     (inception) to              December 31,             (inception) to  
                                                      December 31,           --------------------           December 31,   
                                                          1994               1995            1996              1996
                                                          ----               ----            ----              ----
<S>                                            <C>                        <C>               <C>             <C>  
Revenues:
      License fee                              $                 -                -         1,000,000         1,000,000
      Grant revenue                                              -           90,813           436,081           526,894
                                                          --------        ---------         ---------       ----------- 
             Total revenues                                      -           90,813         1,436,081         1,526,894
                                                          --------        ---------         ---------       ----------- 
Operating expenses incurred in the 
      development stage:
         Research and development                           75,779        2,930,106         6,694,703         9,700,588
         General and administrative                        243,318        1,091,299         1,421,524         2,756,141
                                                          --------        ---------         ---------       ----------- 
             Total operating expenses                      319,097        4,021,405         8,116,227        12,456,729
                                                          --------        ---------         ---------       ----------- 
             Loss from operations                         (319,097)      (3,930,592)       (6,680,146)      (10,929,835)
Interest income, net                                         -               75,730           285,142           360,872
                                                          --------        ---------         ---------       ----------- 
             Net loss                          $          (319,097)      (3,854,862)       (6,395,004)      (10,568,963)
                                                          ========        =========         =========       =========== 
Accretion of redemption value attribut-
      able to mandatorily redeemable
      convertible preferred stock                                -           19,104         1,597,341         1,616,445
                                                          --------        ---------         ---------       ----------- 
Net loss allocable to common
      shareholders                             $          (319,097)      (3,873,966)       (7,992,345)      (12,185,408)
                                                          ========        =========         =========       =========== 

Pro forma net loss per share                                          $        (.98)             (.93)
                                                                          =========         ========= 
Shares used in computing pro forma
      net loss per share                                                  3,931,743         6,839,674
                                                                          =========         ========= 
</TABLE> 

See accompanying notes to financial statements.

                                      F-4
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                 Statements of Stockholders' Equity (Deficit)
           Period December 5, 1994 (inception) to December 31, 1994
                and the years ended December 31, 1995 and 1996

<TABLE> 
<CAPTION> 
                                                                                                        
                                                                              Common stock                                 Notes    
                                                                     -----------------------------        Additional     receivable 
                                                                       Number                               paid-in       on common 
                                                                      of shares           Amount            capital         stock   
                                                                      ---------           ------            -------         -----   

<S>                                                                  <C>            <C>                  <C>              <C> 
Balance, December 5, 1994 (inception)                                           -               -                     -           - 

      Issuance of common stock to founders                                828,750   $       1,657                79,593      (1,625)
      Amortization of deferred compensation                                     -               -                     -           - 
      Net loss for period                                                       -               -                     -           - 
                                                                  ---------------      ----------     -----------------    -------- 

Balance, December 31, 1994                                                828,750           1,657                79,593      (1,625)

      Proceeds from notes receivable                                            -               -                     -       1,625 
      Issuance costs of Series A and B preferred stock                          -               -               (46,912)          - 
      Unrealized gains on available for sale securities                         -               -                     -           - 
      Amortization of deferred compensation                                     -               -                     -           - 
      Accretion of redemption value attributable to mandatorily
         redeemable convertible preferred stock                                 -               -               (19,104)          - 
      Value attributed to issuance of warrants                                  -               -                90,000           - 
      Net loss                                                                  -               -                     -           - 
                                                                  ---------------      ----------     -----------------    -------- 

Balance, December 31, 1995                                                828,750           1,657               103,577           - 

      Deferred compensation resulting from grant of options                     -               -               753,461           - 
      Amortization of deferred compensation                                     -               -                     -           - 
      Unrealized gains on available for sale securities                         -               -                     -           - 
      Issuance costs of Series C preferred stock                                -               -               (27,100)          - 
      Exercise of common stock options                                     72,420             145                 6,955           - 
      Value attributed to issuance of warrants                                  -               -                19,920           - 
      Accretion of redemption value attributable
         to mandatorily redeemable convertible preferred stock                  -               -            (1,597,341)          - 
      Conversion of preferred stock to common stock                     5,588,191          11,177            16,253,022           - 
      Issuance of  common stock, net of issuance costs                  2,587,500           5,175            16,246,502           - 
      Net loss                                                                  -               -                     -           - 
                                                                  ---------------      ----------     -----------------    -------- 
Balance, December 31, 1996                                              9,076,861   $      18,154            31,758,996           - 
                                                                  ===============      ==========     =================    ======== 

<CAPTION> 

                                                                                 Unrealized      Deficit
                                                                                   gains on     accumulated          Total
                                                                                  available      during the      stockholders'
                                                                    Deferred        for sale     development          equity
                                                                  compensation     securities       stage           (deficit)
                                                                  ------------     ----------       -----            -------

Balance, December 5, 1994 (inception)                                        -              -                 -                 -

      Issuance of common stock to founders                             (79,625)             -                 -                 -
      Amortization of deferred compensation                             15,925              -                 -            15,925
      Net loss for period                                                    -              -          (319,097)         (319,097)
                                                                  ------------     ----------       -----------       -----------
Balance, December 31, 1994                                             (63,700)             -          (319,097)         (303,172)

      Proceeds from notes receivable                                         -              -                 -             1,625
      Issuance costs of Series A and B preferred stock                       -              -                 -           (46,912)
      Unrealized gains on available for sale securities                      -         26,742                 -            26,742
      Amortization of deferred compensation                             15,925              -                 -            15,925
      Accretion of redemption value attributable to mandatorily
         redeemable convertible preferred stock                              -              -                 -           (19,104)
      Value attributed to issuance of warrants                               -              -                 -            90,000
      Net loss                                                               -              -        (3,854,862)       (3,854,862)
                                                                  ------------     ----------        ----------       -----------
Balance, December 31, 1995                                             (47,775)        26,742        (4,173,959)       (4,089,758)

      Deferred compensation resulting from grant of options           (753,461)             -                 -                 -
      Amortization of deferred compensation                            139,899              -                 -           139,899
      Unrealized gains on available for sale securities                      -         31,569                 -            31,569
      Issuance costs of Series C preferred stock                             -              -                 -           (27,100)
      Exercise of common stock options                                       -              -                 -             7,100
      Value attributed to issuance of warrants                               -              -                 -            19,920
      Accretion of redemption value attributable
         to mandatorily redeemable convertible preferred stock               -              -                 -        (1,597,341)
      Conversion of preferred stock to common stock                          -              -                 -        16,264,199
      Issuance of  common stock, net of issuance costs                       -              -                 -        16,251,677
      Net loss                                                               -              -        (6,395,004)       (6,395,004)
                                                                  ------------     ----------        ----------       -----------
Balance, December 31, 1996                                            (661,337)        58,311       (10,568,963)       20,605,161
                                                                  ============     ==========        ==========       ===========
</TABLE> 

See accompanying notes to financial statements.

                                      F-5
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                           Statements of Cash Flows

           Period December 5, 1994 (inception) to December 31, 1994,
          the years ended December 31, 1995 and 1996, and the period
               December 5, 1994 (inception) to December 31, 1996

<TABLE> 
<CAPTION> 

                                                                                                                                    

                                                                                                                        Period     
                                                                      December 5,                                     December 5,  
                                                                         1994               Year ended                   1994      
                                                                    (inception) to          December 31,             (inception) to 
                                                                     December 31,       --------------------          December 31,  

                                                                          1994          1995            1996            1996
                                                                          ----          ----            ----            ----
<S>                                                                <C>               <C>             <C>            <C> 
Cash flows from operating activities:
      Net loss                                                     $     (319,097)   (3,854,862)     (6,395,004)    (10,568,963)
      Adjustments to reconcile net loss to net cash
         used in operating activities:
             Non-cash compensation expense                                 15,925        15,925         139,899         171,749
             Non-cash warrant value                                           -          90,000          19,920         109,920
             Depreciation and amortization expense                            -          -               58,022          58,022
             Changes in assets and liabilities:
                 Other current assets                                      (2,000)     (101,948)        (93,223)       (197,171)
                 Other assets                                                 -         (56,471)         20,471         (36,000)
                 Accounts payable                                           2,207       308,353          45,611         356,171
                 Accrued expenses and other current liabilities           103,335     1,095,604       1,135,087       2,334,026
                                                                         --------   -----------     -----------     -----------
                 Net cash used in operating activities                   (199,630)   (2,503,399)     (5,069,217)     (7,772,246)
                                                                         --------   -----------     -----------     -----------
Cash flows from investing activities:
      Purchase of equipment                                                   -         -              (730,052)       (730,052)
      Purchase of short-term investments                                      -     (11,018,731)    (15,335,938)    (26,354,669)
      Sales of short-term investments                                         -       4,363,754          -            4,363,754
      Maturities of short-term investments                                    -       2,305,337       8,006,520      10,311,857
                                                                         --------   -----------     -----------     -----------
                 Net cash used in investing activities                        -      (4,349,640)     (8,059,470)    (12,409,110)
                                                                         --------   -----------     -----------     -----------
Cash flows from financing activities:
      Net proceeds from issuance of preferred stock                        60,000     6,648,088       7,223,155      13,931,243
      Net proceeds from issuance of common stock                              -          -           16,258,777      16,258,777
      Proceeds received on notes receivable                                   -           1,625          -                1,625
      Proceeds from notes payable                                         162,500       517,500          12,500         692,500
      Payment of notes payable                                                -          -              (50,000)        (50,000)
      Obligation under capital lease                                          -          -              157,521         157,521
                                                                         --------   -----------     -----------     -----------
                 Net cash provided by financing activities                222,500     7,167,213      23,601,953      30,991,666
                                                                         --------   -----------     -----------     -----------
Net increase in cash and cash equivalents                                  22,870       314,174      10,473,266      10,810,310
Cash and cash equivalents at beginning of period                              -          22,870         337,044          -
                                                                         --------   -----------     -----------     -----------
Cash and cash equivalents at end of period                         $       22,870       337,044      10,810,310      10,810,310
                                                                         ========   ===========     ===========     =========== 
Supplemental disclosure of noncash transactions:
      Conversion of Note Payable to Series A and
         Series B Preferred Stock                                  $          -         642,500          -              642,500
      Conversion of mandatorily redeemable convertible
         preferred stock to common shares                                     -             -        16,264,199      16,264,199
      Notes issued for 828,750 common shares                                1,625           -            -                1,625
      Deferred compensation                                                79,625           -           753,461         833,086
      Accretion of redemption value attributable to
         mandatorily redeemable convertible preferred stock                   -          19,104       1,597,341       1,616,445
      Unrealized gains on available for sale securities                       -          26,742          31,569          58,311
                                                                         ========   ===========     ===========     =========== 
</TABLE> 

See accompanying notes to financial statements.

                                      F-6
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                         Notes to Financial Statements

                          December 31, 1995 and 1996


 (1)    Organization and Business Activities

        ViroPharma Incorporated (a development stage Company) (the "Company")
        was incorporated in Delaware on December 5, 1994. The Company is a
        development stage biopharmaceutical company committed to the discovery,
        development, and commercialization of novel small molecule drugs to
        treat infections caused by RNA viruses. The accompanying financial
        statements include the results of operations of the Company from
        December 5, 1994 (inception) to December 31, 1996.

        The Company is devoting substantially all of its efforts towards
        conducting drug discovery and development, raising capital, conducting
        clinical trials and pursuing regulatory approval for products under
        development, and recruiting personnel and building infrastructure. In
        the course of such activities, the company has sustained operating
        losses and expects such losses to continue for the foreseeable future.
        The Company has not generated any significant revenues or product sales
        and has not achieved profitable operations or positive cash flow from
        operations. The Company's deficit accumulated during the development
        stage aggregated $10,568,963 through December 31, 1996. There is no
        assurance that profitable operations, if ever achieved, could be
        sustained on a continuing basis.

        The Company plans to continue to finance its operations with a
        combination of stock issuances, private placements and follow-on public
        offerings, license payments, payments from strategic research and
        development arrangements and, in the longer term, revenues from product
        sales. There are no assurances, however, that the Company will be
        successful in obtaining an adequate level of financing needed for the
        long-term development and commercialization of its planned products.

 (2)    Basis of Accounting and Summary of Significant Accounting Policies

                Cash and cash equivalents

                The Company considers all highly liquid investments with an
                original maturity of three months or less when purchased to be
                cash equivalents. All cash and cash equivalents are held in
                United States (U.S.) financial institutions, including
                commercial paper of U.S. companies, with a cost and fair value
                of $248,659 at December 31, 1995 and a cost and fair value of
                $11,047,013 and $11,074,310, respectively, at December 31, 1996.

                Short-term investments

                Short-term investments consist primarily of debt securities
                backed by the U.S. government. The Company's entire short-term
                investment portfolio is currently classified as available for
                sale and is stated at fair value as determined by quoted market
                values. Changes in the net unrealized holding gains and losses
                are included as

                                      F-7
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                   Notes to Financial Statements, Continued

 (2)    Basis of Accounting and Summary of Significant Accounting Policies,
cont.

                a separate component of stockholders' equity (deficit). For
                purposes of determining gross realized gains and losses, the
                cost of short-term investments sold is based upon specific
                identification. The Company has not experienced any significant
                realized gains or losses on its investments through December 31,
                1996.

                Concentration of credit risk

                The Company invests its excess cash and short-term investments
                in accordance with a policy objective that seeks to ensure both
                liquidity and safety of principal. The policy limits investments
                to certain types of instruments issued by the U.S. government
                and institutions with strong investment grade credit ratings and
                places restrictions in their terms and concentrations by type
                and issuer.

                Equipment and leasehold improvements

                Equipment and leasehold improvements are recorded at cost.
                Depreciation and amortization is computed on a straight-line
                basis over the useful lives of the assets or the lease term,
                whichever is shorter, ranging from two to seven years.

                The Company leases certain of its equipment and facilities under
                operating leases. Operating lease payments are charged to
                operations over the related period that such leased equipment is
                utilized in service.

                Assets and liabilities related to capital leases are recorded at
                the present value of the future minimum rental payments using
                interest rates appropriate at the inception of the lease.
                Capital lease amortization is included with depreciation and
                amortization expense.

                Expenditures for repairs and maintenance are expensed as
                incurred.

                Patent costs

                Patent application and maintenance costs are expensed as
                incurred.

                Research and development

                Research and product development costs are expensed as incurred.

                Licensed technology

                Costs incurred in obtaining the license rights to technology in
                the research and development stage are expensed as incurred and
                in accordance with the specific contractual terms of such
                license agreements.

                                      F-8
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                    Notes to Financial Statements, Continued

 (2)    Basis of Accounting and Summary of Significant Accounting Policies,
cont.

                Accounting for income taxes

                Deferred income tax assets and liabilities are determined based
                on differences between the financial statement reporting and tax
                bases of assets and liabilities and are measured using the
                enacted tax rates and laws that will be in effect when the
                differences are expected to reverse. The measurement of deferred
                income tax assets is reduced, if necessary, by a valuation
                allowance for any tax benefits which are not expected to be
                realized. The effect on deferred income tax assets and
                liabilities of a change in tax rates is recognized in the period
                that such tax rate changes are enacted.

                Revenue recognition - collaborative research, contract and 
                license agreements

                Collaborative research revenue from cost-reimbursement and grant
                agreements are recorded as the related expenses are incurred, up
                to the contractual limits. Contract and licensing revenue is
                recognized when milestones are met and the Company's specific
                performance obligations have been satisfied in accordance with
                the terms of the respective agreements. Cash received that is
                related to future performance under such contracts is deferred
                and recognized as revenue when earned.

                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 amounts reported
                in the financial statements and accompanying notes. Actual
                results could differ from those estimates.

                Reverse Stock Split

                On November 5, 1996, the Company effected a reverse stock split
                of its common stock on a .51-for-1 basis. All common share and
                pro forma per share amounts in the accompanying financial
                statements have been retroactively adjusted to reflect the
                reverse stock split for all periods presented. Preferred stock
                amounts have not been retroactively adjusted to reflect the
                reverse stock split.

                Stock-based compensation

                The Company accounts for its stock option plan 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 cost is measured
                on the date of grant as the excess of the current market price
                of the underlying stock over the exercise price. Such
                compensation amounts are amortized over the respective vesting
                periods of the option grant. On January 1, 1996, the Company
                adopted the disclosure provisions of SFAS No. 123, "Accounting
                for Stock-Based Compensation", which permits entities to provide
                pro forma net income (loss) and pro forma earnings (loss) per
                share disclosures for employee stock option grants made in 1995
                and in future years as if the fair-value based method defined in
                SFAS No. 123 had been applied. The Company has elected to
                continue to apply the accounting provisions of APB Opinion No 25
                and provide the pro forma disclosure requirements of SFAS No.
                123.

                                      F-9
<PAGE>
 
                            ViroPharma Incorporated
                          (A Development Stage Company)

                    Notes to Financial Statements, Continued

 (2)    Basis of Accounting and Summary of Significant Accounting Policies,
cont.

                Pro forma net loss per share

                For periods subsequent to the Company's Initial Public Offering
                (IPO), net loss per share is calculated by dividing the net loss
                by the weighted average number of common shares outstanding for
                the respective periods adjusted for the dilutive effect, if any,
                of common stock equivalents which consist of stock options and
                warrants using the treasury stock method. Common stock
                equivalents that are anti-dilutive are excluded from net loss
                per share calculations subsequent to the IPO.

                For periods prior to the Company's IPO, all common and common
                equivalent shares from stock options and warrants and
                convertible preferred stock issued during the twelve-month
                period prior to the IPO at prices below the IPO price are
                presumed to have been issued in contemplation of the IPO and
                have been included in the calculation of pro-forma net loss per
                share as if they were outstanding for all periods presented
                (using the treasury stock method and an IPO price of $7.00 per
                share). The calculation of shares used in computing pro-forma
                net loss per share prior to the Company's IPO also included all
                series of mandatorily redeemable convertible preferred stock,
                assuming conversion into shares of common stock (using the
                if-converted method) from their respective original dates of
                issuance. In the computation of pro forma net loss per share,
                accretion of the redemption value attributable to mandatorily
                redeemable convertible preferred stock is not included as an
                increase to net loss.

                The following table sets forth the calculation of total number
                of shares used in the computation of pro forma net loss per
                share at December 31, 1995 and 1996:

<TABLE> 
<CAPTION> 

                                                                      1995               1996
                                                                      ----               ----
           <S>                                                     <C>                <C>   
           Weighted average common shares outstanding                828,750          2,053,114
           Incremental shares assumed to be outstanding
                 related to common stock, stock options and
                 warrants granted and convertible preferred
                 stock based on the treasury stock method            853,620            486,123
           Convertible preferred stock (if-converted method)       2,249,373          4,300,437
                                                                   ---------          ---------
           Weighted average common and common
                 equivalent shares used in computation of
                 pro forma net loss per share                      3,931,743          6,839,674

                                                                   =========          =========
</TABLE> 

 (3)    Short-Term Investments

        Short-term investments consist of fixed income securities with original
        maturities of greater than three months but less than one year including
        U.S. treasury instruments of agencies of the U.S. Government and
        high-grade commercial paper. At December 31, 1995 and 1996, all of the
        short-term investments were deemed as "available for sale" investments.

                                      F-10
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                   Notes to Financial Statements, Continued

 (3)    Short-Term Investments, cont.

        The following summarizes the "available for sale" investments at
        December 31, 1995 and 1996:

<TABLE> 
<CAPTION> 

                                                                    Gross           Gross
                                                                  unrealized     unrealized      Fair
                                                      Cost          gains          losses        value
                                                      ----          -----          ------        -----
         <S>                                       <C>             <C>           <C>            <C> 
         Obligations of the U.S. Govern-
               ment and agencies of the U.S.:
                  December 31, 1995                $  4,349,640        26,742            -        4,376,382

                                                    ===========        ======     ========      ===========
         Obligations of the U.S. Govern-
               ment and agencies of the U.S           5,383,095         7,877        6,160        5,384,812
         Commercial paper                             6,295,963        56,594            -        6,352,557
                                                    -----------        ------     --------      -----------
                  December 31, 1996                $ 11,679,058        64,471        6,160       11,737,369

                                                    ===========        ======     ========      ===========
</TABLE> 

 (4)    Equipment and Leasehold Improvements

        Equipment and leasehold improvements consist of the following at
        December 31, 1996:

<TABLE> 
<CAPTION> 

                                                     1996
                                                     ----
     <S>                                         <C>    
     Computer and equipment                      $  603,265
     Leasehold improvements                         126,786
                                                    -------
                                                    730,051
     Less accumulated depreciation
           and amortization                          58,022
                                                    -------
                                                 $  672,029
             
                                                    =======
</TABLE> 

        Included in equipment and leasehold improvements at December 31, 1996 is
        approximately $215,000 of assets held under capital lease.

 (5)    Accrued Expenses and Other Current Liabilities

        Accrued expenses and other current liabilities consist of the following
        at December 31, 1995 and 1996:

<TABLE> 
<CAPTION> 

                                                        1995           1996
                                                        ----           ----
     <S>                                         <C>                 <C> 
     License fee payable                         $    1,036,000      1,333,332
     Clinical development and research                        -        827,175
     Payroll and payroll taxes payable                   72,986         30,329
     Other current liabilities                           89,953        143,190
                                                      ---------      ---------
                                                 $    1,198,939      2,334,026

                                                      =========      =========
</TABLE> 

                                      F-11
<PAGE>
 
                             ViroPharma Incorporated
                          (A Development Stage Company)

                    Notes to Financial Statements, Continued

 (6)    License and Research Agreements

        In December 1995, the Company entered into a license agreement with
        Sanofi S.A. (Sanofi) for its most advanced drug candidate. Under the
        Sanofi agreement, the Company was required to pay a license fee of
        $1,000,000. This amount was charged to operations in 1995 and paid in
        February 1996. In addition, the Company is required to make a milestone
        payment of up to $2,000,000 upon the earlier of the occurrence of a
        future milestone event, as defined, or three years from the date of the
        agreement. The $2,000,000 milestone payment is being charged to
        operations on a pro-rata monthly basis commencing in December 1995 over
        eighteen months, the expected timeframe in which the milestone is
        anticipated to be achieved.

        In connection with the Sanofi agreement, the Company is also required to
        make certain significant additional payments, including royalties, as
        defined, should agreed-upon future milestones be attained. At the
        present time, there can be no assurance that such milestones will be
        attained.

        The Company has entered into various licensing, research and other
        agreements. Under these agreements, the Company is working in
        collaboration with various other parties. Should any discoveries be made
        under such arrangements, the Company would be required to negotiate the
        licensing of the technology for the development of the respective
        discoveries. There are no significant funding commitments under any
        other agreement other than Sanofi.

        In July 1996, the Company entered into a collaborative drug discovery
        and development agreement with Boehringer Ingelheim Pharmaceuticals Inc.
        (BI) for one hepatitis C target identified by the Company. Under this
        agreement, the Company granted to BI the exclusive worldwide rights to
        develop and commercialize compounds discovered under the agreement. In
        return, BI paid a non-refundable technology access fee of $1,000,000 to
        the Company and is required to make certain research and milestone
        payments, as defined, to the Company in connection with the Company's
        transfer of HCV screening and assay technology and at various stages in
        the development of compounds under the agreement. In addition, BI is
        required to make royalty payments to the Company on sales of products
        developed and marketed under this agreement.

        In February 1997, the Company received a $750,000 milestone payment
        related to the BI agreement. Such amount will be recognized as revenue
        in 1997 pursuant to the specific terms of the agreement.

        The Company recognized approximately $340,000 of grant revenue from a
        not-for-profit entity for which a director of the Company serves as an
        officer.

 (7)    Common Stock and Common Stock Options

        On November 22, 1996, the Company completed its Initial Public
        Offering (IPO) of common stock. The Company sold 2,587,500 shares
        (including 337,500 shares excised by the underwriters for the
        overallotment). Net proceeds approximated $16,250,000.

                                      F-12
<PAGE>
 
                             ViroPharma Incorporated
                          (A Development Stage Company)

                    Notes to Financial Statements, Continued

 (7)    Common Stock and Common Stock Options, cont.

        Upon inception of the Company in December 1994, certain members of
        management and a co-founder/director purchased 828,750 shares of common
        stock. Management purchased 663,000 of these shares which vest annually
        over a four-year period. The Company has the right to repurchase any
        unvested shares at the original price paid for such shares should the
        employee leave the Company before such shares are fully vested. A
        co-founder/director purchased 165,750 shares. The difference between the
        deemed fair value and the price paid ($.002) per share, for the
        aforementioned common stock at inception in December 1994 was $79,625,
        which amount was recorded as deferred compensation. Compensation expense
        related to these shares of common stock aggregated $15,925 in each of
        1994, 1995 and 1996. Pursuant to a right granted in December 1994, a
        director purchased in January 1996, 51,000 shares of common stock at
        $.10 per share, pursuant to a restricted stock purchase agreement.

        The Company has adopted the 1995 Stock Option Plan (the "Plan") to
        provide eligible individuals with an opportunity to acquire or increase
        an equity interest in the Company and to encourage such individuals to
        continue in the employment of the Company. Prior to the adoption of the
        Plan, stock options granted in 1994 and 1995 were non-qualified stock
        options. Stock options are granted at the deemed fair market value of
        the stock on the day immediately preceding the date of grant. Stock
        options are exercisable for a period not to exceed ten years from the
        date of grant. Vesting of the stock options occurs, generally 25% per
        year, over four years. There are 1,200,000 shares reserved under the
        Plan.

        Stock option activity from December 5, 1994 (inception) to December 31,
        1996 is as follows:

<TABLE> 
<CAPTION> 

                                                                               Weighted-         Weighted-
                                                                                average           average
                                            Exercise                           remaining         exercise
                                            price per          Share          contractual          price
                                              share           options             life           per share
                                              -----           -------             ----           ---------
     <S>                                  <C>             <C>                 <C>             <C> 
     Balance, December 5, 1994
           (date of inception)                  -                  -                                 -
           Granted                        $    .10              150,349                       $     .10
           Exercised                            -                  -                                 -
           Cancelled                            -                  -                                 -
                                                                ------- 
     Balance, December 31, 1994                .10              150,349           10.0              .10
           Granted                             .20               12,750                             .20
           Exercised                            -                  -                                 -
           Cancelled                            -                  -                                 -
                                                                -------
     Balance, December 31, 1995              .10-.20            163,099           8.7               .11
           Granted                           .20-.45            174,775                             .25
                                              2.16               95,869                            2.16
                                              5.25               23,460                            5.25
           Exercised                           .10              (21,420)                             -
           Cancelled                            -                  -                                 -
                                                                ------- 
     Balance, December 31, 1996              .10-5.25           435,783           8.75              .90
                                                                ======= 
     Shares exercisable at
           December 31, 1996                 .10-.20             24,608                             .13
                                                                ======= 
</TABLE> 

                                      F-13
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                   Notes to Financial Statements, Continued

 (7)    Common Stock and Common Stock Options, cont.

        At December 31, 1996, there were 742,797 shares available for grant
        under the Plan. In January 1997, the Company granted 229,800 options to
        its employees. Such options were granted at exercise prices equal to the
        fair market value at the grant date.

        During 1996, various executive officers and certain employees of the
        Company were granted options to acquire 270,644 shares of common stock
        at exercise prices ranging from $.20 to $2.16 per share. The exercise
        price of the options was equal to the fair market value of the Common
        Stock on the date of grant, as determined by the Board of Directors.
        However, for financial statement purposes, the difference between a
        deemed value in the range of $2.35 to $5.25 per share and the respective
        exercise prices at the grant dates has been recorded as deferred
        compensation ($753,461) and is being amortized over the four-year
        vesting period. Compensation expense for the aforementioned options
        aggregated $123,974 for the year ended December 31, 1996.

        The per share weighted-average fair value of stock options granted
        during 1995 and 1996 ranged from $.14 to $4.45 per share, respectively,
        on the date of grant. Such fair values were determined using the
        Black-Scholes option-pricing model and are based on the following
        weighted-average assumptions: an expected dividend yield of 0%, a
        risk-free interest rate of 7.5%, volatility of 50% and an expected
        option life of ten years.

        The Company applies APB Opinion No. 25 in accounting for its stock
        option plan. Had the Company determined compensation cost for options
        granted during 1995 and 1996 based on the fair value at the grant date
        under SFAS No. 123, the Company's net loss and pro forma net loss per
        share would have been increased to the pro forma amounts under SFAS No.
        123 indicated below:

<TABLE> 
<CAPTION> 

                                                  1995          1996
                                                  ----          ----
<S>                                          <C>             <C> 
Net loss:
      As reported                            $ (3,854,862)   (6,395,004)
      Pro forma under SFAS No 123              (3,855,318)   (6,524,213)
                                                =========     ========= 
Pro forma net loss per share:
      As reported                                    (.98)         (.93)
      Pro forma under SFAS No. 123                   (.98)         (.95)
                                                =========     ========= 
</TABLE> 

        Pro forma net loss reflects only options granted in 1995 and 1996.
        Therefore, the full impact of calculating compensation cost for stock
        options under SFAS No. 123 is not reflected in the pro forma net loss
        amounts presented above because compensation cost is incurred under SFAS
        123 over the respective vesting period of such options, and options
        granted by the Company prior to January 1, 1995 are not reflected in the
        pro forma net loss figures above.

                                      F-14
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                   Notes to Financial Statements, Continued

 (8)    Mandatorily Redeemable Convertible Preferred Stock

        The Company completed the sale of its Series A (675,000 shares) and
        Series B (7,060,000 shares) mandatorily redeemable convertible preferred
        stock (the Preferred Stock) at per share prices of $.50 and $1.00,
        respectively. Aggregate net proceeds from these transactions totaled
        approximately $7,350,000, which included a $162,500 promissory note with
        an investor was converted into Series A Preferred Stock in June 1995.

        On May 31, 1996, the Company sold 3,222,222 shares of Series C
        mandatorily redeemable convertible preferred stock at a per share price
        of $2.25 for aggregate net proceeds of approximately $7,223,000.

        On November 22, 1996, all mandatorily redeemable convertible preferred
        stock was converted into 5,588,191 shares of common stock on a .51 for 1
        basis in connection with completion of the Company's Initial Public
        Offering.

        The Company also secured $480,000 in bridge financing loans in March and
        May 1995, which amounts were converted to Series B preferred stock in
        June 1995.

        In 1995, in connection with the bridge financing, the Company issued
        159,994 warrants to Series B investors to purchase Series B preferred
        stock at the fair value of the Series B preferred stock at the date of
        issuance ($1.00 per share). The deemed fair value of such warrants at
        their issuance date aggregated $90,000, which amount was charged to
        operations in 1995.

        The difference between the deemed fair market value of the Preferred
        Stock and the liquidation amount was accreted on a pro-rata basis in the
        accompanying financial statements through the consummation of the
        Company's IPO in November 1996, at which point all shares of Preferred
        Stock were converted into 5,588,191 common shares. All rights with
        respect to the Preferred Stock ceased upon consummation of the IPO.

(9)     Income Taxes

        At December 31, 1996, the Company had available for Federal and state
        income tax purposes net operating loss carryforwards of approximately
        $1,731,000. Such carryforwards, which expire between 2011 and 1999,
        respectively, are available to reduce future Federal and state taxable
        income, if any.

        Based on "change in ownership" provisions of the Tax Reform Act of 1986,
        net operating loss and research and development credit carryforwards may
        be subject to annual limitations that could reduce the Company's ability
        to utilize these carryforwards in the future.

                                      F-15
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                   Notes to Financial Statements, Continued

 (9)    Income Taxes, cont.

        Significant components of the Company's deferred tax assets and
        liabilities as of December 31, 1995 and 1996 are shown below. At
        December 31, 1996, a valuation allowance of $4,152,890 has been
        recognized to offset the deferred tax assets as realization of such
        assets is uncertain. The change in the valuation allowance for 1995 and
        1996 was an increase of $1,480,287 and $2,545,044 respectively.

<TABLE> 
<CAPTION> 

                                                    1995            1996
                                                    ----            ----
<S>                                              <C>              <C> 
Deferred tax assets:
      Net operating loss carryforwards           $    549,171         758,592
      Capitalized research and
         development costs                          1,033,238       2,848,527
      Expenses not currently deductible                     -         533,333
      Capitalized start-up costs                       50,917          37,918
                                                  -----------     -----------
         Total gross deferred tax assets            1,633,326       4,178,370

Deferred tax liability:
      Employee compensation                            25,480          25,480
                                                  -----------     -----------
         Net deferred tax assets                    1,607,846       4,152,890
Valuation allowance                                (1,607,846)     (4,152,890)
                                                    ---------      ---------- 
         Total deferred tax assets               $          -               -
                                                    =========      ==========
</TABLE> 

(10)    401(k) Profit Sharing Plan

        In 1995, the Company adopted a 401(k) Profit Sharing Plan (the "401(k)
        Plan") available to all employees meeting certain eligibility criteria.
        The 401(k) Plan permits participants to contribute up to 15% of their
        compensation not to exceed the limits established by the Internal
        Revenue Code. All contributions made by participants vest immediately in
        the participant's account. The Company did not contribute to the 401(k)
        Plan in 1995 or 1996.

(11)    Commitments

        In September 1995, the Company entered into a lease arrangement for the
        financing of certain lab equipment, leasehold improvements, computers
        and office equipment. The terms range from three to four years.

        The lease line expired in September 1996. In connection with this
        arrangement, 63,750 warrants to purchase Series B preferred stock were
        originally granted to the lessor at the original Series B issuance price
        of $1.00 per share. The deemed fair value of such warrants at their
        issuance date aggregated $63,750, which amount is being amortized to
        operations over the term of the lease arrangement. The number of
        warrants and the related exercise price were adjusted based on a formula
        to reflect the increase in per share price of the Series C Preferred
        Stock over Series B Preferred Stock and the .51 for 1 reverse stock
        split to 21,675 warrants to purchase common stock at an exercise price
        of $2.94 per share.

                                      F-16
<PAGE>
 
                            ViroPharma Incorporated
                         (A Development Stage Company)

                   Notes to Financial Statements, Continued

(11)    Commitments, cont.

        In October 1995, the Company entered into an operating lease agreement
        for its present corporate facilities. The lease term is for two years
        with a one year renewal option, subject to lessor consent. The option
        was exercised in February 1997 extending the term of the lease to
        October 1998.

        In December 1995, the Company entered into a capital lease arrangement
        for the financing of certain equipment. The terms of this arrangement
        are for four years from the date of funding. The maximum amount that can
        be financed under this arrangement is $620,000, which includes $120,000
        of used equipment which the Company is obligated to purchase at the end
        of the lease term for $24,000.

        The Company's future minimum lease payments under the aforementioned
        leases for years subsequent to December 31, 1996 are as follows:

<TABLE> 
<CAPTION> 

               Year ending                                Operating             Capital
              December 31,                                  leases               leases
              ------------                                  ------               ------
              <S>                                        <C>                   <C> 
                  1997                                   $   378,337             69,545
                  1998                                       330,121             69,545
                  1999                                       152,827             51,302
                  2000                                        45,747              2,373
                  2001 and thereafter                              -                  -
                                                             -------            -------
                        Total minimum lease payments     $   907,032            192,765
                                                             =======        
              Amounts representing interest                                     (35,244)
                                                                                -------
              Present value of net minimum lease
                payments                                                        157,521
              Current portion                                                    52,950
                                                                                -------
                        Long-term portion                                     $ 104,571
                                                                                =======
</TABLE> 

        Rent expense for the period from December 5, 1994 (date of inception) to
        December 31, 1994 and the years ended December 31, 1995 and 1996
        aggregated $20,000, $271,000 and $335,000, respectively.

(12)    Subsequent Events (unaudited)

        In February 1997, the Company entered into a $600,000 loan agreement
        with a bank. The term of the loan is six years, with principal and
        interest due monthly. The interest rate is approximately 9% and is
        secured by certain equipment and a $300,000 certificate of deposit.

                                      F-17
<PAGE>
 
                                 EXHIBIT INDEX

  Exhibit         Description
  -------         -----------

  24              Power of Attorney (included on signature page).

  27              Financial Data Schedule.

  99              Important Factors Regarding Forward-Looking Statements.

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996
<PERIOD-START>                             JAN-01-1995             JAN-01-1996
<PERIOD-END>                               DEC-31-1995             DEC-31-1996
<CASH>                                         337,044              10,810,310
<SECURITIES>                                 4,376,382              11,737,369
<RECEIVABLES>                                        0                       0
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                             4,817,374              22,744,850
<PP&E>                                               0                 672,029
<DEPRECIATION>                                       0                  58,022
<TOTAL-ASSETS>                               4,873,845              23,452,879
<CURRENT-LIABILITIES>                        1,546,999               2,743,147
<BONDS>                                              0                       0
                        7,416,604                       0
                                          0                       0
<COMMON>                                         1,657                  18,154
<OTHER-SE>                                 (4,091,415)              20,587,007
<TOTAL-LIABILITY-AND-EQUITY>                 4,873,845              23,452,879
<SALES>                                              0                       0
<TOTAL-REVENUES>                                90,813               1,436,081
<CGS>                                                0                       0
<TOTAL-COSTS>                                4,021,405               8,116,227
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                            (3,854,862)             (6,395,004)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                        (3,930,592)             (6,680,146)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                               (3,854,862)             (6,395,004)
<EPS-PRIMARY>                                    (.98)                   (.93)
<EPS-DILUTED>                                        0                       0
        

</TABLE>

<PAGE>
 
                                                                      Exhibit 99

                            ViroPharma Incorporated
            Important Factors Regarding Forward-Looking Statements


       The following factors, among others, could cause actual results to differ
  significantly from those contained in forward-looking statements made in this
  report and presented elsewhere by management from time to time.

  Early Stage of Development; Continuing Operating Losses; Uncertainty of Future
  Profitability

       ViroPharma Incorporated (the "Company") is a development stage company
  which currently has no sources of operating revenues and has incurred net
  operating losses since its inception in 1994.  At December 31, 1996, the
  Company had an accumulated deficit of $10,568,963. Such losses have resulted
  principally from costs incurred in research, development and clinical trials
  and general and administrative costs associated with the Company's operations.
  The Company expects that operating losses will continue at increasing levels
  for at least the next several years as its research, product development,
  clinical testing and marketing activities expand.  Such losses will continue
  unless and until such time as product approvals are obtained and product sales
  generate sufficient revenue to offset expenses.  The Company's ability to
  achieve profitability will depend, in part, on its ability to successfully
  develop, clinically test and obtain regulatory approvals for its drug
  candidates, as well as its ability to manufacture and market any approved
  products either by itself or in collaboration with others.  There can be no
  assurance that the Company will successfully complete its product development
  efforts in a timely manner, if at all, that it will receive any regulatory
  approvals required for the clinical development, commercial manufacture or
  marketing of its proposed products or that product sales based on such
  regulatory approvals will be profitable to the Company.  Accordingly, the
  extent of future losses and the time required to achieve profitability is
  highly uncertain.  See "Management's Discussion and Analysis of Financial
  Condition and Results of Operations" in Item 7 of this Annual Report on Form
  10-K.

  Absence of Products; Product Development Risks

       The Company has not completed the development of any products.  Some of
  the Company's drug candidates are currently undergoing clinical trials while
  others are in research or preclinical development.  The Company's drug
  candidates, other than pleconaril, are not expected to be commercially
  available for at least several years, if at all, and pleconaril is not
  expected to be commercially available for at least three years, if at all.
  The Company has not begun to market or generate revenues from the
  commercialization of any products.  The majority of the Company's drug
  candidates will require significant additional research and development and
  laboratory testing prior to submission of any regulatory application, and all
  of its drug candidates will require significant clinical testing and
  regulatory approval prior to commercialization.  There can be no assurance
  that the Company will be permitted by regulatory authorities to conduct
  additional clinical testing of the Company's compounds or that, if permitted,
  such additional clinical testing will prove that such drugs are safe and
  efficacious to the extent necessary to permit the Company to obtain marketing
  approvals for them from regulatory authorities.  There can be no assurance
  that the results of preclinical studies and completed clinical trials will be
  indicative of results obtained in future clinical trials.  Adverse or
  inconclusive clinical trial results concerning any of the Company's drug
  candidates could result in increased costs and significantly delay the filing
  for marketing approval for such drug candidates with the United States Food
  and Drug Administration (the "FDA") or result in a filing for a narrower
  indication.  In such event, further studies would be required with respect to
  other indications to support any filing of a supplemental application covering
  such indications.  There can be no assurance that the Company's research and
  development, preclinical testing or clinical trials will be successfully
  completed, that regulatory approvals will be obtained or will be as broad as
  sought, that the Company's products will be capable of being produced in
  commercial quantities at reasonable costs or that any products, if introduced,
  will achieve market acceptance.  Any problems or delays relating to research
  and development, regulatory approval and manufacturing, and the failure to
  address such problems or delays, could have a material adverse effect on the
  Company. See"Business--Product Development and Research" in Item 1 of this
  Annual Report on Form 10-K.

                                       1
<PAGE>
 
       The Company's drug candidates and future product development efforts are
  subject to the risks of failure inherent in the development of pharmaceutical
  products.  These risks include the possibilities that any or all of the
  Company's drug candidates will be found to be ineffective, unsafe, toxic or
  otherwise fail to either meet applicable regulatory standards or receive
  necessary regulatory approvals or clearances.  There can be no assurance that
  unacceptable toxicities or side effects will not occur at any dose level at
  any time in the course of toxicological studies or human clinical trials of
  the Company's drugs.  The appearance of any such unacceptable toxicities or
  side effects in toxicology studies or human clinical trials could cause the
  Company or regulatory authorities to interrupt, limit, delay or abort the
  development of any of the Company's drugs and could ultimately prevent their
  approval for any of the targeted indications.  Even after receiving approval,
  products may later exhibit adverse effects that prevent their widespread use
  and necessitate their withdrawal from the market.  There can be no assurance
  that any products under development by the Company will be safe when
  administered to patients.  Furthermore, there is a risk that the Company's
  drug candidates, even if safe and effective, will be difficult to develop into
  commercially viable products, difficult to manufacture on a large scale or
  uneconomical to market and that proprietary rights of third parties may
  preclude the Company from marketing such drug candidates.  Moreover, the
  Company's competitors may succeed in developing technologies or products that
  are more effective or cost effective than those of the Company.  Rapid
  technological changes or developments by others may result in the Company's
  drug candidates becoming obsolete or noncompetitive.  See  "Business--
  Competition" in Item 1 of this Annual Report on Form 10-K, and "--Competition"
  and"--Rapid Technological Change and Uncertainty" in this Exhibit 99 to
  Annual Report on Form 10-K.

  Dependence on Most Advanced Drug Candidate

       The Company's research and development resources are primarily dedicated
  to its most advanced drug candidate, pleconaril.  Significant delays in the
  Company's clinical trials of pleconaril, unfavorable results in such trials,
  failure to obtain regulatory approval for the commercialization of pleconaril
  or any related product or failure to achieve market acceptance of pleconaril
  or any related product could have a material adverse effect upon the Company.
  There can be no assurance that pleconaril will be successfully developed.
  Although the Company is currently seeking to develop other drug candidates and
  expand the number of drug candidates it has under development, there can be no
  assurance that it will be successful in such development or expansion.
  Furthermore, the Company will require additional funding to complete all
  clinical studies and other required testing for pleconaril or any other of the
  Company's product development candidates.  See "--Government Regulation; No
  Assurance of Regulatory Approval" and "--Uncertain Ability to Meet Capital
  Needs" in this Exhibit 99 to Annual Report on Form 10-K.

  Uncertainty Regarding Clinical Trials

       The results of preclinical studies and initial clinical trials of the
  Company's product candidates are not necessarily predictive of the results
  from large-scale clinical trials.  The Company must demonstrate through
  preclinical studies and clinical trials that its product candidates are safe
  and effective for use in each target indication before the Company can obtain
  regulatory approvals for the commercial sale of those products.  These studies
  and trials may be very costly and time-consuming.

       The rate of completion of clinical trials is dependent upon, among other
  factors, the rate of enrollment of patients.  Because some of the Company's
  drug candidates are targeted at diseases which are more prevalent in certain
  seasons, failure to accrue an adequate number of clinical patients during the
  appropriate season could cause significant delays and increased costs.  Such
  delays and increased costs could have a material adverse effect on the
  Company's drug development program.  Furthermore, there can be no assurance
  that if the Company's clinical trials are completed, the Company will be able
  to submit a New Drug Application (an "NDA") as scheduled or that any such
  application will be approved by the FDA in a timely manner, if at all.  The
  cost to the Company of conducting human clinical trials for any potential
  product can vary dramatically based on a number of factors, including the
  order and timing of clinical indications pursued and the extent of development
  and financial support, if any, from corporate collaborators.  The Company may
  have difficulty obtaining sufficient patient populations, clinicians or
  support to conduct its clinical trials as planned and may have to expend
  substantial additional funds to obtain access to such resources, or delay or
  modify its plans significantly.

                                       2
<PAGE>
 
  Government Regulation; No Assurance of Regulatory Approval

       The production and marketing of products under development by the
  Company, as well as its ongoing research and development activities, are and
  will be subject to regulation by governmental agencies, including the FDA in
  the United States and similar regulatory authorities in other countries.  Any
  potential therapeutic product developed by the Company will be subject to
  rigorous preclinical and clinical testing and approval pursuant to regulations
  administered by the FDA, comparable agencies in other countries and, to a
  lesser extent, by state regulatory authorities.  The approval process for the
  Company's drug candidates will involve significant time and expenditures.
  There can be no assurance that the Company will be able to successfully
  complete the clinical development of, and file its NDA for, pleconaril or any
  other drug candidate.  See "Business-Government Regulation" in Item 1 of this
  Annual Report on Form 10-K.

       Rigorous preclinical and clinical testing and the regulatory approval
  process can take many years and require the expenditure of substantial
  resources.  There can be no assurance that the FDA or other regulatory
  authority approval for any product candidates developed by the Company will be
  granted on a timely basis or at all.  Any delay in obtaining, or any failure
  to obtain, such approvals would materially and adversely affect the marketing
  of the Company's drug candidates and the Company's business, financial
  position and results of operations.  In addition, legislation may be enacted,
  or regulations promulgated, in the future which might adversely affect the
  Company's ability to develop, manufacture or market its drug candidates.  If
  regulatory approval of a drug is obtained, such approval may be conditioned
  upon certain limitations and restrictions on the drug's use.  Any FDA
  approvals that may be granted will be subject to continual review, and later
  discovery of previously unknown problems may result in withdrawal of products
  from marketing.  Failure of the Company to comply with applicable regulatory
  requirements can, among other things, result in warning letters, fines,
  withdrawal of regulatory approvals, product recalls, seizure of products,
  operating restrictions, injunctions or criminal prosecution.  See "Business--
  Government Regulation" in Item 1 of this Annual Report on Form 10-K.

  Uncertain Ability to Meet Capital Needs

       The Company will require substantial additional funds for its research,
  preclinical and clinical testing, operating expenses, regulatory applications,
  manufacturing, marketing and sales programs.  The Company has incurred losses
  from its operations since inception.  The Company expects to incur additional
  operating losses over at least the next several years.  The Company expects
  such losses to increase over historical levels as the Company's research and
  development expenses increase due to further clinical trials and preclinical
  development of the Company's most advanced drug candidate, pleconaril, and
  further research and development related to other product candidates.
  Moreover, the Company's capital requirements will depend on numerous factors,
  including the progress of its research and development programs, the progress
  of preclinical and clinical testing, the time and cost involved in obtaining
  regulatory approvals, the cost of filing, prosecuting, defending and enforcing
  any patent claims and other intellectual property rights, competing
  technological and market developments, changes and developments in the
  Company's existing collaborative, licensing and other relationships, the terms
  of any new collaborative, licensing and other arrangements that the Company
  may establish and the development of commercialization activities and
  arrangements. The Company's fixed commitments, including salaries and fees for
  current employees and consultants, rent, payments under license agreements and
  other contractual commitments, are substantial and are likely to increase as
  additional agreements are entered into and additional personnel are retained.
  The Company's cash requirements may vary materially and could significantly
  increase because of results of research and development and drug candidate
  testing, relationships with strategic partners, changes in the focus and
  direction of the Company's research and development programs, competitive and
  technological advances, the FDA and foreign regulatory requirements and other
  factors.  See "Business--Strategic Relationships" and "Business--Patents" in
  Item 1 of this Annual Report on Form 10-K, "Management's Discussion and
  Analysis of Financial Condition and Results of Operations--Liquidity and
  Capital Resources" in Item 7 of this Annual Report on Form 10-K and the Notes
  to Financial Statements in this Annual Report on Form 10-K.

                                       3
<PAGE>
 
       The Company will need to raise substantial additional capital to fund its
  future operations.  The proceeds from the Company's initial public offering in
  November 1996 and proceeds from the collaborative drug discovery and
  development agreement with Boehringer Ingelheim, available cash and interest
  income are not expected to be sufficient to complete all clinical studies and
  other required testing for pleconaril or any other of the Company's product
  candidates.  The Company will likely seek such additional funding through
  public or private financing or collaborative, licensing and other arrangements
  with corporate partners.  If additional funds are raised by issuing equity
  securities, further dilution to existing stockholders will result, and future
  investors may be granted rights superior to those of existing stockholders.
  There can be no assurance, however, that additional financing will be
  available when needed or, if available, will be available on acceptable terms.
  Insufficient funds may prevent the Company from executing its business plan or
  may require the Company to delay, scale back or eliminate certain of its
  research and product development programs or license to third parties rights
  to develop or commercialize products or technologies that the Company would
  otherwise seek to develop or commercialize itself.

  Dependence on Corporate Collaborations; Need for Additional Collaborators

       The Company's strategy for the research, development and
  commercialization of its drug candidates may require the Company to enter into
  various arrangements with corporate and academic collaborators, licensors,
  licensees and others, and the Company may, therefore, be dependent upon the
  subsequent success of these third parties in performing their
  responsibilities.  The Company has obtained, and intends to obtain in the
  future, licensed rights to certain proprietary technologies and compounds from
  other entities, individuals and research institutions, to which it will be
  obligated to pay license fees and, if it develops products based upon the
  licensed technology, to also make milestone payments and pay royalties.  There
  can be no assurance that the Company will be able to enter into collaborative,
  license or other arrangements that the Company deems necessary or appropriate
  to develop and commercialize its drug candidates, or that any or all of the
  contemplated benefits from such collaborative, license or other arrangements
  will be realized.  Certain of the collaborative, license or other arrangements
  that the Company may enter into in the future may place responsibility on the
  Company's collaborative partners for preclinical testing and human clinical
  trials and for the preparation and submission of applications for regulatory
  approval for potential pharmaceutical or other products.  Should any
  collaborative partner fail to develop or successfully commercialize any drug
  candidate to which it has rights, the Company's business may be materially
  adversely affected.  Moreover, these arrangements may require the Company to
  transfer certain material rights to such corporate partners, licensees and
  others.  In the event that the Company decides to license or sublicense
  certain of its commercial rights, there can be no assurance that such
  arrangements will not result in reduced product revenue to the Company.  There
  can be no assurance that any revenues or profits will be derived from the
  Company's collaborative and other arrangements, that any of the Company's
  current strategic arrangements will continue or that the Company will enter
  into any future collaborations. Furthermore, there can be no assurance that
  current or future collaborators will not pursue alternative technologies or
  drug candidates either on their own or in collaboration with others, including
  the Company's competitors, as a means for developing treatments for the
  diseases sought to be addressed by the Company's programs.  See "Business--
  Strategic Relationships" in Item 1 of this Annual Report on Form 10-K.

  Uncertain Ability to Protect Patents and Proprietary Technology and
  Information

       Because of the substantial length of time and expense associated with
  bringing new products through development and regulatory approval to the
  market place, the pharmaceutical industry places considerable importance on
  obtaining patent and trade secret protection for new technologies, products
  and processes.  The Company's ability to compete effectively depends, in part,
  on its ability to protect its proprietary technology, both in the United
  States and abroad.  The Company intends to file applications as appropriate
  for patents covering the composition of matter or uses of its drug candidates
  or its proprietary processes.  The Company has six patent applications pending
  with the U.S. Patent and Trademark Office ("PTO"), and the Company has
  licensed the exclusive rights to antiviral agents which are the subject of two
  issued U.S. patents and two related Canadian patent applications.  The Company
  will be dependent on the licensor to prosecute such patent applications and
  may be dependent on the licensor to protect such patent rights. The Company
  also has filed four patent applications in certain foreign jurisdictions on
  inventions developed by the Company.  There can be no assurance that the PTO
  or such foreign jurisdictions will grant the Company's pending

                                       4
<PAGE>
 
  patent applications or that the Company will obtain any patents on its
  proprietary products for which it subsequently applies.  No assurance can be
  given that any patents issued to, or licensed by, the Company will not be
  challenged, invalidated or circumvented by other parties, or that the rights
  granted thereunder will provide any competitive advantage.  Furthermore, there
  can be no assurance that others will not independently develop similar
  products, duplicate any of the Company's products or, if patents are issued to
  the Company, design around the patented products developed by the Company.

       The Company also relies on trade secrets, know-how and continuing
  technological advancements to support its competitive position.  Although the
  Company has entered into confidentiality and invention rights agreements with
  its employees, consultants, advisors and collaborators, no assurance can be
  given that such agreements will be honored or that the Company will be able to
  effectively protect its rights to its unpatented trade secrets and know-how.
  Moreover, there can be no assurance that others will not independently develop
  substantially equivalent proprietary information and techniques or otherwise
  gain access to the Company's trade secrets and know-how.  In addition, many of
  the Company's scientific and management personnel have been recruited from
  other pharmaceutical companies where they were conducting research in areas
  similar to those being pursued by the Company.  As a result, the Company and
  these individuals could be subject to allegations of trade secret violations
  and similar claims.

       In addition, to facilitate development of its proprietary technology
  base, the Company may be required to obtain licenses to patents or other
  proprietary rights from other parties, and such requirements could
  substantially delay the Company's drug development or commercialization.
  There can be no assurance that the patents of other parties will not have a
  material adverse effect on the ability of the Company to do business or that
  any licenses required under any patents or proprietary rights of other parties
  would be made available on acceptable terms, if at all.  If the Company does
  not obtain any such required licenses, it could encounter delays in
  introducing products to market or may be unable to develop, manufacture or
  sell products requiring such licenses.  The Company has not conducted any
  searches or made any independent investigations of the existence of any
  patents or proprietary rights of other parties.

       The Company may, from time to time, collaborate with, and support
  research conducted by, universities and governmental research organizations.
  There can be no assurance that the Company will have, or be able to acquire,
  exclusive rights to the inventions or technical information derived from such
  collaborations or that disputes will not arise as to rights in related
  research programs conducted by the Company or such collaborators.  See
  "Business--Strategic Relationships" in Item 1 of this Annual Report on Form
  10-K.

       In addition, the Company could incur substantial costs in defending any
  patent infringement suits or in asserting any patent rights, including those
  licensed to the Company by third parties, and in defending suits against it or
  its employees relating to ownership of or rights to intellectual property,
  even if the outcome is not adverse to the Company. Such disputes could
  substantially delay the Company's drug development or commercialization.  The
  PTO or a private party could institute an interference proceeding involving
  the Company in connection with one or more of the Company's patents or patent
  applications, and such proceedings could result in an adverse decision as to
  priority of invention, in which case the Company would not be entitled to a
  patent on the invention at issue in the interference proceeding.  The PTO or a
  private party could also institute reexamination proceedings involving the
  Company in connection with one or more of the Company's patents, and such
  proceedings could result in an adverse decision as to the validity or scope of
  the patents.  Opposition or revocation proceedings could be instituted in the
  patent offices of foreign jurisdictions, which proceedings, if decided
  adversely to the Company would prevent the Company from establishing a patent
  position in such jurisdiction based on the opposed or revoked patent.  See
  "Business--Patents" in Item 1 of this Annual Report on Form 10-K.

  Absence of Marketing and Sales Capability

       For certain products under development, the Company intends to conduct
  marketing activities through its own sales force.  The Company has no
  marketing and sales staff and has no experience with respect to marketing its
  proposed products.  Significant additional expenditures, management resources
  and time will be required to develop a sales force, and there can be no
  assurance that the Company will be successful either in developing a sales
  force or penetrating the

                                       5
<PAGE>
 
  markets for any proposed products it may develop.  The Company has entered,
  and in the future may enter, into marketing, distribution, manufacturing,
  development or other third party arrangements, which grant rights that may be
  exclusive to certain products to corporate partners in return for royalties to
  be received on sales, if any.  There can be no assurance that the Company will
  be able to enter into any additional arrangements, that any such arrangements
  will be successful or that the Company will be able to obtain additional
  capital to conduct such activities directly.  See "Business--Marketing" in
  Item 1 of this Annual Report on Form 10-K, and "Dependence on Corporate
  Collaborations; Need for Additional Collaborators" in this Exhibit 99 to
  Annual Report on Form 10-K.

  Uncertainty of Pharmaceutical Pricing and Related Matters; Need for
  Reimbursement

       The future revenues and profitability of, and availability of capital
  for, pharmaceutical companies such as the Company will be affected by the
  continuing efforts of governmental and private third-party payors to contain
  or reduce the costs of health care through various means.  There have been,
  and the Company expects there will continue to be, a number of federal, state
  and foreign proposals to control the cost of drugs through governmental
  regulation.  It is uncertain what form any health care reform legislation may
  take or what actions federal, state, foreign, and private payors may take in
  response to the proposed reforms.  The Company cannot predict when, if ever,
  any suggested reforms will be implemented or the effect of any implemented
  reform on the Company's business.  Moreover, there can be no assurance that
  any implemented reform will not have a material adverse effect on the
  Company's business, financial position or results of operations.

       The Company's ability to commercialize any products successfully will
  depend, in part, on the extent to which reimbursement for the cost of such
  products and related treatments will be available from government health
  administration authorities, such as Medicare and Medicaid in the United
  States, private health insurers and other organizations.  Significant
  uncertainty exists as to the reimbursement status of newly approved health
  care products, particularly for indications for which there is no current
  effective treatment or for which medical care typically is not sought, and
  there can be no assurance that adequate third-party coverage will be available
  to enable the Company to maintain price levels sufficient to realize an
  appropriate return on its investment in product research and development. If
  adequate coverage and reimbursement levels are not provided by government and
  third-party payors for use of the Company's products, the market acceptance of
  those products could be adversely affected.

  Competition

       There are many entities, both public and private, including well-known,
  large pharmaceutical companies, chemical companies, biotechnology companies
  and research institutions, engaged in developing pharmaceuticals for human
  therapeutic applications similar to the applications targeted by the Company.
  Many of these companies have substantially greater financial, research and
  development, manufacturing, marketing and human resources experience than the
  Company.  In addition, many of the Company's competitors have significantly
  greater experience than the Company in conducting preclinical testing and
  human clinical trials of new pharmaceutical products and in obtaining FDA and
  other regulatory approvals of products.  Accordingly, certain of the Company's
  competitors may succeed in obtaining regulatory approval for products more
  rapidly or effectively than the Company.  Such companies may succeed in
  developing products that are more effective or less costly than any that may
  be developed by the Company and also may prove to be more successful than the
  Company in the manufacture and marketing of any such products.  See "Business-
  -Competition" in Item 1 of this Annual Report on Form 10-K.

  Rapid Technological Change and Uncertainty

       The Company is engaged in the pharmaceutical business, which is
  characterized by extensive research efforts and rapid technological progress.
  New developments in molecular biology, medicinal chemistry and other fields of
  biology and chemistry are expected to continue at a rapid pace in both
  industry and academia.  There can be no assurance that research and
  discoveries by others will not render some or all of the Company's programs or
  drug candidates non-competitive or obsolete.

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<PAGE>
 
       The Company's proposed business strategy is based, in part, upon the
  application of the Company's technology platform, which encompasses various
  elements from the fields of biotechnology and chemistry, and the application
  of these technologies to the discovery and development of pharmaceutical
  products for the treatment of infectious human diseases.  This strategy is
  subject to the risks inherent in the development of new products using new and
  emerging technologies and approaches.  There are no approved drugs on the
  market for the treatment of certain of the disease indications being targeted
  by the Company, and the Company believes that the technologies being used by
  the Company have never been applied to develop an approved pharmaceutical
  product.  There can be no assurance that unforeseen problems will not develop
  with the Company's technologies or applications, that the Company will be able
  to successfully address technological challenges it encounters in its research
  and development programs or that commercially feasible products will
  ultimately be developed by the Company.  See "Business--Competition" in Item 1
  of this Annual Report on Form 10-K, and "Competition" in this Exhibit 99 to
  this Annual Report on Form 10-K.

  No Assurance of Market Acceptance

       There can be no assurance that the Company's drug candidates, if approved
  by the FDA and other regulatory authorities, will achieve market acceptance.
  The degree of market acceptance will depend upon a number of factors,
  including the receipt and timing of regulatory approvals, the availability of
  third-party reimbursement and the establishment and demonstration in the
  medical community of the clinical safety, efficacy and cost-effectiveness of
  the Company's drug candidates and their advantages over existing technologies
  and therapeutics.  There can be no assurance that the Company will be able to
  manufacture and successfully market its drug candidates even if they perform
  successfully in clinical applications.  Furthermore, there can be no assurance
  that physicians or the medical community in general will accept and utilize
  any therapeutic products that may be developed by the Company.

  Absence of Manufacturing Capabilities

       The Company presently does not have the internal capability to
  manufacture pharmaceutical products under the current Good Manufacturing
  Practices ("GMP") prescribed by the FDA.  The Company believes that it has
  sufficient quantities of bulk drug substance to complete its clinical program
  for the viral meningitis indication and hand-foot-and-mouth disease, and its
  planned clinical trial for "summer flu."  The Company may require additional
  quantities of pleconaril drug substance to complete its planned clinical trial
  for the common cold.  The Company is working with Sanofi S.A. for the
  manufacture of bulk drug substance and is also evaluating alternatives for the
  manufacture of drug product.  FDA pre-approval inspection is required for all
  commercial manufacturing sites.

       Any contract manufacturers that the Company may use must adhere to GMP
  regulations enforced by the FDA through its facilities inspection program.
  These facilities must pass a pre-approval plant inspection before the FDA will
  issue a pre-market approval of the product.  Moreover, while the Company does
  not currently intend to manufacture any pharmaceutical products itself, it may
  choose to do so in the future.  The Company has no experience in the
  manufacture of pharmaceutical products for clinical trials or commercial
  purposes.  Should the Company decide to manufacture products itself, the
  Company would be subject to the regulatory requirements described above, would
  be subject to risks regarding delays or difficulties encountered in
  manufacturing any such pharmaceutical products and would require substantial
  additional capital.  In addition, there can be no assurance that the Company
  will be able to manufacture any such products successfully and in a cost-
  effective manner.  See "Business--Manufacturing" and "Business--Government
  Regulation" in Item 1 of this Annual Report on Form 10-K.

       If the Company should encounter delays or difficulties with contract
  manufacturers in producing, packaging or distributing its proposed products,
  market introduction and subsequent sales of such products would be adversely
  affected, and the Company may have to seek alternative sources of supply.  In
  the event that the Company is required to seek alternative sources of supply,
  it may incur additional costs or delays in product commercialization.  If the
  Company changes the source or location of supply or modifies the manufacturing
  process, regulatory authorities will require the Company to demonstrate that
  the product produced by the new source or from the modified process is
  equivalent to the product used in any clinical trials conducted by the
  Company.  If the product is not shown to be equivalent, the Company's ability
  to seek FDA or other regulatory approval could be delayed until additional
  clinical

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<PAGE>
 
  trials are completed.  Furthermore, there can be no assurance that the Company
  will be able to enter into alternative supply arrangements at commercially
  acceptable rates, if at all.  No assurance can be given that the manufacturers
  utilized by the Company will be able to provide the Company with sufficient
  quantities of its products or that the products supplied to the Company will
  meet the Company's specifications or delivery and other requirements.

  Dependence on Key Personnel

       Because of the specialized scientific nature of the Company's business,
  the Company is highly dependent upon its ability to attract and retain
  qualified scientific, technical and managerial personnel.  There is intense
  competition for qualified personnel in the pharmaceutical field, and there can
  be no assurance that the Company will be able to continue to attract and
  retain qualified personnel necessary for the development of its business.  The
  loss of the services of existing personnel, as well as the failure to recruit
  additional key scientific, technical and managerial personnel in a timely
  manner would be detrimental to the Company's research and development programs
  and to its business.  Much of the know-how developed by the Company resides in
  its scientific and technical personnel and is not readily transferable to
  other personnel.  The Company does not maintain "key man" life insurance on
  any of its employees. Furthermore, the Company's anticipated growth and
  expansion into areas and activities requiring additional expertise, such as
  marketing, will require the addition of new management personnel.  The failure
  to attract and retain such personnel could adversely affect the Company's
  business.  See "Business--Human Resources" in Item 1 of this Annual Report on
  Form 10-K.

  Environmental Matters and Hazardous Materials

       The Company's research and development processes involve the controlled
  use of hazardous, infectious and radioactive materials.  The Company is
  subject to stringent federal, state and local laws, rules, regulations and
  policies governing the use, generation, manufacture, storage, air emission,
  effluent discharge, handling and disposal of certain materials and wastes.
  There can be no assurance that the Company will not be required to incur
  significant costs to comply with environmental laws, rules, regulations and
  policies or that the business, financial position or results of operations of
  the Company will not be materially and adversely affected by current or future
  environmental laws, rules, regulations and policies or by any releases or
  discharges of materials which could be hazardous.

       In its research activities, the Company utilizes radioactive and other
  materials that could be hazardous to human health, safety or the environment.
  These materials and various wastes resulting from their use are stored at the
  Company's facility pending ultimate use and disposal. Although the Company
  believes that its safety procedures for handling and disposing of such
  materials comply with federal, state and local laws, rules regulations and
  policies, the risk of accidental injury or contamination from these materials
  cannot be entirely eliminated.  In the event of such an accident, the Company
  could be held liable for any resulting damages, and any such liability could
  exceed the Company's resources.  The Company does not maintain a separate
  insurance policy for these types of risks.

  Product Liability; Limited Insurance Coverage

       The Company's business exposes it to potential product liability risks
  which are inherent in the testing, manufacturing and marketing of human
  therapeutic products.  The Company maintains claims made insurance against
  product liability and defense costs incurred in connection with clinical
  testing in the amount of five million dollars per occurrence and five million
  dollars in the aggregate.  The Company does not currently have any insurance
  coverage with regard to the commercial sale of products.  There can be no
  assurance that claims against the Company arising with respect to clinical
  testing or sale of products will be successfully defended, that the insurance
  carried by the Company, if any, will be sufficient or that the Company will be
  able to obtain additional, or maintain its current level of, product liability
  insurance on acceptable terms.  In addition, there can be no assurance that
  any collaborators and licensees of the Company will agree to indemnify the
  Company from, be adequately insured against or have a sufficient net worth to
  protect the Company from product liability claims.  A successful claim against
  the Company in excess of the Company's insurance coverage could have a
  material adverse effect on the Company.

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