Avian influenza, Viet Nam--update.
D000810:Angola / Q000453:epidemiology; D006801:Humans; D007214:Indonesia / Q000453:epidemiology; D007251:Influenza, Human / Q000453:epidemiology*; D011051:Poliomyelitis / Q000453:epidemiology*; D012307:Risk Factors; D018571:Sentinel Surveillance; D014744:Vietnam / Q000453:epidemiology