From the Centers for Disease Control and Prevention. Update: influenza activity, 1992.
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