title: [Variation of influenza viruses].
mesh_terms: D000941:Antigens / Q000032:analysis; D014644:Genetic Variation; D009975:Orthomyxoviridae / Q000276:immunology / Q000472:pathogenicity; D012367:RNA, Viral / Q000032:analysis; D011995:Recombination, Genetic
chemical_list: D000941:Antigens; D012367:RNA, Viral