title: Possible antigenic sub-divisions within the variola/vaccinia subgroup of poxviruses.
mesh_terms: D000956:Antigens, Viral / Q000032:analysis; D006358:Hot Temperature; D009500:Neutralization Tests; D011212:Poxviridae / Q000145:classification* / Q000276:immunology; D014616:Vaccinia virus / Q000145:classification* / Q000276:immunology; D012901:Variola virus / Q000145:classification* / Q000276:immunology
chemical_list: D000956:Antigens, Viral