Influenza surveillance.
D001315:Australia / Q000453:epidemiology; D001938:Brazil / Q000453:epidemiology; D002677:Chile / Q000453:epidemiology; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D007723:Korea / Q000453:epidemiology; D010219:Papua New Guinea / Q000453:epidemiology; D012606:Scotland / Q000453:epidemiology