[Classification of influenza viruses and problems of new viruses].
D000368:Aged; D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D004196:Disease Outbreaks; D006801:Humans; D007251:Influenza, Human / Q000276:immunology; D009975:Orthomyxoviridae / Q000145:classification* / Q000276:immunology
D000914:Antibodies, Viral