title: Studies on the origin of pandemic influenza. I. Antigenic analysis of A 2  influenza viruses isolated before and after the appearance of Hong Kong influenza using antisera to the isolated hemagglutinin subunits.
mesh_terms: D000818:Animals; D000941:Antigens / Q000032:analysis*; D000956:Antigens, Viral / Q000032:analysis; D002642:Chick Embryo; D003429:Cross Reactions; D004196:Disease Outbreaks / Q000382:microbiology*; D000939:Epitopes; D004912:Erythrocytes / Q000276:immunology; D005827:Genetics, Microbial; D006385:Hemagglutination Inhibition Tests; D006386:Hemagglutination Tests; D006389:Hemagglutinins, Viral / Q000032:analysis / Q000302:isolation & purification; D006723:Hong Kong; D006801:Humans; D007106:Immune Sera; D005779:Immunodiffusion; D007251:Influenza, Human / Q000382:microbiology*; D009439:Neuraminidase / Q000032:analysis; D009975:Orthomyxoviridae / Q000201:enzymology / Q000276:immunology*; D011817:Rabbits / Q000276:immunology; D011995:Recombination, Genetic; D013045:Species Specificity; D014776:Virus Cultivation
chemical_list: D000941:Antigens; D000956:Antigens, Viral; D000939:Epitopes; D006389:Hemagglutinins, Viral; D007106:Immune Sera; D009439:Neuraminidase