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April 26, 2004

MedImmune to Provide Strategic Update for Investors on April 27, 2004

GAITHERSBURG, Md., April 26 /PRNewswire-FirstCall/ -- MedImmune, Inc. (Nasdaq: MEDI) today announced that it will hold a conference call with investors to discuss the dissolution of its collaboration agreements with Wyeth for FluMist(TM) on Tuesday, April 27, 2004 at 9:00 a.m. eastern time.

The live webcast and related information can be accessed by going to the Investor Relations section of the MedImmune website at www.medimmune.com. Following the webcast, an archived version of the call will be available at the same address until May 4, 2004.

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.

This announcement may contain, in addition to historical information, certain forward-looking statements that involve risks and uncertainties. Such statements reflect management's current views and are based on certain assumptions. Actual results could differ materially from those currently anticipated as a result of a number of factors, including risks and uncertainties discussed in the company's filings with the U.S. Securities and Exchange Commission. The company is developing several products 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.
    -0-                             04/26/2004
    /CONTACT:  Investors, John Filler, +1-301-398-4086 or media, Jamie Lacey,
+1-301-398-4035, both of MedImmune, Inc./
    /Web site:  http://www.medimmune.com/
    (MEDI)

CO:  MedImmune, Inc.
ST:  Maryland
IN:  MTC BIO HEA
SU:  CCA

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6952 04/26/2004 16:55 EDT http://www.prnewswire.com