title: [Antigenic mutability of influenza virus types A2, B and C in the People's Republic of Bulgaria during the period 1956-1967].
mesh_terms: D000941:Antigens / Q000032:analysis*; D002031:Bulgaria; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007106:Immune Sera; D005779:Immunodiffusion; D007251:Influenza, Human / Q000382:microbiology; D008433:Mathematics; D009154:Mutation; D009500:Neutralization Tests; D009975:Orthomyxoviridae / Q000276:immunology*
chemical_list: D000941:Antigens; D007106:Immune Sera
vernacular_title: Antigennaia izmenchivost' virusov grippa tipov A2, B i C v Narodnoĭ Respublike Bolgarii v period 1956-1967 gg.