News Pressroom

May 21, 2004

FTC Clears MedImmune Reacquisition of Intranasal Influenza Vaccine Products

GAITHERSBURG, Md., May 21 /PRNewswire-FirstCall/ -- MedImmune, Inc. (Nasdaq: MEDI) announced today that the Federal Trade Commission has terminated the review period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 for the company's reacquisition of FluMist(TM) (Influenza Virus Vaccine Live, Intranasal) and related technology from Wyeth (NYSE: WYE). MedImmune expects to close the termination of the collaboration in the near future.

As announced on April 26, 2004, MedImmune and Wyeth agreed that MedImmune would reacquire the rights to the FluMist franchise and all related technology, including the next generation, liquid formulation known as CAIV-T (Cold Adapted Influenza Vaccine-Trivalent) now in Phase 3 development.

David M. Mott, MedImmune's president and chief executive officer, stated: "Now that governmental clearance has been granted, we can finalize the termination of our collaboration for FluMist with Wyeth and assume full responsibility for the commercialization of FluMist and the development of CAIV-T. Over the next three years we plan to educate physicians and healthcare professionals, particularly pediatricians, on the benefits of influenza vaccinations, as well as work to develop CAIV-T into a superior vaccine for children."

About CAIV-T

CAIV-T is an investigational intranasal, cold-adapted trivalent influenza vaccine. It is the next generation, refrigerator-stable formulation of FluMist, which is a frozen, live attenuated cold-adapted trivalent influenza vaccine. To date, the safety, tolerability and efficacy of CAIV-T has been studied in both healthy and at-risk populations between the ages of 6 weeks and 98 years. Some of these data were presented in October 2003 at the Fifth Annual Options for the Control of Influenza Conference in Okinawa, Japan as well as at the Pediatric Academic Societies' annual meeting earlier this month.

About FluMist

FluMist is the first live, attenuated influenza vaccine indicated for active immunization for the prevention of disease caused by influenza A and B viruses in healthy children and adolescents, 5 to 17 years of age, and healthy adults, 18 to 49 years of age.

There are risks associated with all vaccines, including FluMist. FluMist does not protect 100 percent of individuals vaccinated. FluMist is not indicated for immunization of individuals less than 5 years of age, or 50 years of age and older.

FluMist is contraindicated in persons with hypersensitivity to any component of the vaccine, including eggs; in children and adolescents receiving aspirin therapy or aspirin-containing therapy; in individuals with a history of Guillain-Barre syndrome; and in individuals with known or suspected immune deficiency. The safety and efficacy of FluMist have not been established in pregnant women or for patients with chronic underlying medical conditions, including asthma or reactive airways disease; the vaccine should not be administered to these patients. In placebo-controlled clinical trials, the most common solicited adverse events in healthy children (n=214) included runny nose/nasal congestion, cough, irritability, headache, decreased activity, sore throat, fever (oral temperature>100 F), muscle aches, chills, and vomiting. The most common adverse events in healthy adults (n=2,548) included runny nose, headache, sore throat, tiredness/weakness, muscle aches, cough, and chills. See Prescribing Information for indications and usage, dosage and administration, and safety information.

About MedImmune

MedImmune is a leading biotechnology company focused on researching, developing and commercializing products to prevent or treat infectious disease, autoimmune disease and cancer. MedImmune actively markets four products, Synagis(R) (palivizumab), Ethyol(R) (amifostine), FluMist(TM) (Influenza Virus Vaccine Live, Intranasal), and CytoGam(R) (cytomegalovirus immune globulin intravenous (human)), and has additional products in clinical testing. MedImmune employs approximately 1,800 people, is headquartered in Gaithersburg, Maryland, and has additional operations in Frederick, Maryland, as well as Pennsylvania, California, the United Kingdom and the Netherlands. For more information on MedImmune and its products, visit the company's website at www.medimmune.com.

DISCLOSURE NOTICE: The information contained in this document is as of May 20, 2004 and will not be updated as a result of new information or future events. This document contains forward-looking statements regarding MedImmune's future financial performance and business prospects. Those statements involve substantial risks and uncertainties. You can identify those statements by the fact that they contain words such as "anticipate," "believe," "estimate," "expect," "intend," "project" or other terms of similar meaning. Those statements reflect management's current beliefs and are based on numerous assumptions, which MedImmune cannot control and which may not develop as MedImmune expects. Consequently, actual results may differ materially from those projected in the forward-looking statements. Among the factors that could cause actual results to differ materially are: seasonal demand for and continued supply of our principal product, Synagis; whether FluMist receives clearance by the Food and Drug Administration and, if it does, whether it will be successfully launched at a favorable price; availability of competitive products in the market; availability of third- party reimbursement for the cost of our products; effectiveness and safety of our products; exposure to product liability, intellectual property or other types of litigation; foreign currency exchange rate fluctuations; changes in generally accepted accounting principles; growth in costs and expenses; the impact of acquisitions, divestitures and other unusual items; and the risks, uncertainties and other matters discussed in MedImmune's Annual Report on Form 10-K for the year ended December 31, 2003, its quarterly reports on Form 10-Q and its current reports on Form 8-K filed with the U.S. Securities and Exchange Commission. MedImmune cautions that RSV disease occurs primarily during the winter months; MedImmune believes its operating results will reflect that seasonality for the foreseeable future. MedImmune is also developing several products (including FluMist) for potential future marketing. There can be no assurance that such development efforts will succeed, that such products will receive required regulatory clearance or that, even if such regulatory clearance were received, such products would ultimately achieve commercial success.

SOURCE  MedImmune, Inc.
CONTACT:  Media: Jamie Lacey, +1-301-398-4035, or Investors: Peter Vozzo,
+1-301-398-4358, or John Filler, +1-301-398-4086, all of MedImmune, Inc.
Web site:  http://www.medimmune.com