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MMWR Morb Mortal Wkly Rep. 2002 Jun 14;51(23):503-6.

Update: Influenza activity--United States and worldwide, 2001-02 season, and composition of the 2002-03 influenza vaccine.


The 2001-02 influenza season in the United States was mild to moderate. Influenza A (H3N2) viruses predominated, but influenza B viruses were identified more frequently than influenza A viruses toward the end of the season. Worldwide, influenza A (H3N2) and B viruses predominated.This report summarizes influenza activity in the United States (September 30, 2001-May 18, 2002) and worldwide (October-May) during the 2001-02 influenza season and describes the composition of the 2002-03 influenza vaccine.

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