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MMWR Morb Mortal Wkly Rep. 2001 Jun 8;50(22):466-79.

Update: influenza activity--United States and worldwide, 2000-01 season, and composition of the 2001-02 influenza vaccine.


The 2000-01 influenza season was mild in the United States and was the first season since 1995-96 that was not predominated by A (H3N2) viruses. Influenza A (H1N1) viruses predominated in the United States. In some regions, however, influenza B viruses were reported more frequently than influenza A viruses. Worldwide, influenza A (H1N1) and B viruses also predominated. This report summarizes U.S.* and worldwide influenza activity during the 2000-01 influenza season and describes the composition of the 2001-02 influenza vaccine.

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