title: Antigenic variants of influenza virus.
mesh_terms: D000941:Antigens; D002462:Cell Membrane / Q000201:enzymology / Q000276:immunology; D004196:Disease Outbreaks; D005827:Genetics, Microbial; D006801:Humans; D007125:Immunogenetics; D007251:Influenza, Human / Q000276:immunology; D009439:Neuraminidase / Q000378:metabolism; D009975:Orthomyxoviridae / Q000276:immunology*; D013997:Time Factors
chemical_list: D000941:Antigens; D009439:Neuraminidase