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U.S. Department of Health and Human Services

Vaccines, Blood & Biologics

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Influenza Virus Vaccine for the 2003-2004 Season

The trivalent influenza vaccine prepared for the 2003-2004 season will include A/New Caledonia/20/99 (H1N1); A/Panama/2007/99 (H3N2), which is an A/Moscow/10/99-like virus; and B/Hong Kong/330/2001-like virus. (The actual influenza B virus being used in vaccines is either B/Hong Kong/330/2001 or B/Hong Kong/1434/02.) These viruses are the same as the viruses used for production of vaccine for the 2002-2003 season. Vaccine produced for the 2002-2003 season is now past its expiration date. It is recommended that vaccine not be used beyond its labeled expiration date.

There are currently no anticipated shortages or delays in the availability of influenza vaccine for the 2003-2004 flu season. Information will be made available on this web site in the event that shortage situations or delays in distribution arise.