title: [Comparative characteristics of epidemic strains of the influenza virus B isolated in 1980-1981].
abstract: The epidemic situation of 1980-1981 was conditioned by the emergence of new antigenic variants of influenza B virus with an altered composition of hemagglutinin and neuraminidase. The strains isolated in the epidemic season of 1980-1981 vary in their antigenic and biological properties and the degree of relationship with previously circulating influenza B viruses, although they show sufficient stability of molecular weights of major virion polypeptides. Influenza B viruses occurring after 1972 should be classified into a new, 5th group. The epidemic strains which were spread in 1980-1981 belong to this group although they represent already new drift variants.
mesh_terms: D000956:Antigens, Viral / Q000032:analysis; D004196:Disease Outbreaks; D000939:Epitopes / Q000032:analysis; D006389:Hemagglutinins, Viral / Q000032:analysis; D006801:Humans; D007251:Influenza, Human / Q000382:microbiology*; D009439:Neuraminidase / Q000032:analysis / Q000276:immunology; D009975:Orthomyxoviridae / Q000276:immunology* / Q000302:isolation & purification; D014586:USSR
chemical_list: D000956:Antigens, Viral; D000939:Epitopes; D006389:Hemagglutinins, Viral; D009439:Neuraminidase
vernacular_title: Sravnitel'naia kharakteristika épidemicheskikh shtammov virusa grippa B 1980-1981 gg. vydeleniia.