title: [Qualitative antigenic differences in influenza virus A2].
mesh_terms: D000956:Antigens, Viral; D003168:Complement Fixation Tests; D004739:England; D006723:Hong Kong; D009975:Orthomyxoviridae / Q000145:classification / Q000276:immunology*; D012426:Russia; D012846:Singapore
chemical_list: D000956:Antigens, Viral
vernacular_title: Kachestvennye antigennye razlichiia virusa grippa A2.