Global surveillance of influenza.
D000956:Antigens, Viral / Q000235:genetics; D004812:Epidemiologic Methods; D014644:Genetic Variation; D006801:Humans; D009980:Influenza A virus / Q000276:immunology; D007251:Influenza, Human / Q000453:epidemiology / Q000401:mortality / Q000517:prevention & control*; D009017:Morbidity; D009975:Orthomyxoviridae / Q000276:immunology; D014944:World Health Organization
D000956:Antigens, Viral