title: Are there antigenic variants of hepatitis A virus?
mesh_terms: D000956:Antigens, Viral / Q000302:isolation & purification*; D000939:Epitopes; D006507:Hepatovirus / Q000276:immunology*; D006801:Humans; D011863:Radioimmunoassay / Q000379:methods; D012703:Serotyping
chemical_list: D000956:Antigens, Viral; D000939:Epitopes