title: Update: influenza activity--United States and worldwide, 1992.
abstract: During the 1991-92 influenza season, influenza activity was reported at moderate levels in many parts of the world. Influenza A(H1N1), A(H3N2), and influenza B viruses have continued to circulate worldwide. From October 1991 through February 1992, when influenza viruses circulated widely in the Northern Hemisphere, epidemic levels of activity were most commonly associated with the H3N2 subtype of influenza A (1). This report summarizes worldwide influenza activity reported from March through September 1992 and activity in the United States from October 1991 through September 1992.
mesh_terms: D000293:Adolescent; D000349:Africa / Q000453:epidemiology; D000368:Aged; D000569:Americas / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D002648:Child; D004196:Disease Outbreaks; D005060:Europe / Q000453:epidemiology; D006801:Humans; D009980:Influenza A virus; D009981:Influenza B virus; D007251:Influenza, Human / Q000453:epidemiology*; D010139:Pacific Islands / Q000453:epidemiology; D014481:United States / Q000453:epidemiology