title: Antigenic variants of arboviruses. 3. Host passage selection of constituent antigen subpopulations of strains.
mesh_terms: D000818:Animals; D000941:Antigens / Q000032:analysis*; D002642:Chick Embryo; D046508:Culture Techniques; D004668:Encephalitis Viruses / Q000276:immunology*; D006385:Hemagglutination Inhibition Tests; D007106:Immune Sera; D051379:Mice; D009500:Neutralization Tests; D014776:Virus Cultivation
chemical_list: D000941:Antigens; D007106:Immune Sera