title: Update: influenza activity--United States and worldwide, 2000-01 season, and composition of the 2001-02 influenza vaccine.
abstract: 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.
mesh_terms: D014943:Global Health; D006801:Humans; D009980:Influenza A virus; D009981:Influenza B virus; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D012621:Seasons; D014481:United States / Q000453:epidemiology
chemical_list: D007252:Influenza Vaccines