title: Immunity conferred by smallpox vaccine. How long does immunity last?
authors: Adam
authors: A
authors: Jacobs
mesh_terms: D006801:Humans; D007156:Immunologic Memory / Q000502:physiology*; D012899:Smallpox / Q000517:prevention & control*; D012900:Smallpox Vaccine / Q000276:immunology*; D013997:Time Factors
chemical_list: D012900:Smallpox Vaccine