title: Old smallpox vaccination may still protect.
authors.forename: Janice
authors.initials: J
authors.lastname: Hopkins Tanne
mesh_terms: D006801:Humans; D012899:Smallpox / Q000517:prevention & control*; D012900:Smallpox Vaccine / Q000276:immunology*; D013997:Time Factors
chemical_list: D012900:Smallpox Vaccine