title: [Return of the influenza A-prime virus and the problem of the origin of pandemic strains].
mesh_terms: D000818:Animals; D004196:Disease Outbreaks / Q000453:epidemiology*; D006801:Humans; D009980:Influenza A virus / Q000276:immunology / Q000302:isolation & purification / Q000472:pathogenicity*; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology / Q000382:microbiology; D014586:USSR; D014774:Virulence
vernacular_title: Vozvrashchenie virusa grippa A-prim i problema proiskhozhdeniia pandemicheskikh shtammov.