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