title: Update: influenza activity--worldwide, 1994.
abstract: From October 1993 through August 1994, influenza activity occurred at moderate to moderately severe levels worldwide. Influenza A(H3N2) viruses predominated during the 1993-94 season, but influenza B viruses also were isolated from persons with sporadic illness and from outbreak-associated cases. Cocirculation of influenza A(H3N2) and influenza B viruses is continuing throughout the world; however, the isolation of influenza A(H1N1) viruses has been extremely rare (1). This report summarizes influenza activity worldwide from March through August 1994.
mesh_terms: D000349:Africa / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D002489:Central America / Q000453:epidemiology; D005060:Europe / Q000453:epidemiology; D014943:Global Health; D006801:Humans; D009980:Influenza A virus / Q000302:isolation & purification; D009981:Influenza B virus / Q000302:isolation & purification; D007251:Influenza, Human / Q000453:epidemiology*; D009656:North America / Q000453:epidemiology; D010139:Pacific Islands / Q000453:epidemiology; D013020:South America / Q000453:epidemiology