title: Letter: Selective smallpox vaccination for special risk groups.
mesh_terms: D006801:Humans; D010564:Personnel, Hospital; D012899:Smallpox / Q000517:prevention & control*; D012900:Smallpox Vaccine / Q000008:administration & dosage; D014481:United States; D014611:Vaccination
chemical_list: D012900:Smallpox Vaccine