title: Further observations on geographic variation in the antigenic character of West Nile and Japanese B viruses.
mesh_terms: D000349:Africa; D000941:Antigens; D001208:Asia; D001211:Asia, Western; D004668:Encephalitis Viruses; D004672:Encephalitis, Japanese; D008296:Malaysia; D014902:West Nile virus
chemical_list: D000941:Antigens