title: Smallpox and the ABO system association: a critical review.
mesh_terms: D000017:ABO Blood-Group System; D001938:Brazil; D005838:Genotype; D006801:Humans; D007194:India; D010641:Phenotype; D012899:Smallpox / Q000097:blood* / Q000235:genetics
chemical_list: D000017:ABO Blood-Group System