title: [Clinical characteristics of influenza caused by different variants of influenza virus type A (A2 and A1)].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004196:Disease Outbreaks; D006801:Humans; D009980:Influenza A virus; D007251:Influenza, Human / Q000175:diagnosis*; D008875:Middle Aged; D014586:USSR
vernacular_title: Klinicheskie osobennosti grippa, vyzvannogo raznymi variantami virusa tipa A (A2 i A1).