title: 25th Anniversary of the last case of naturally acquired smallpox.
mesh_terms: D023482:Bioterrorism; D014943:Global Health; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D012899:Smallpox / Q000453:epidemiology / Q000266:history / Q000517:prevention & control; D012900:Smallpox Vaccine / Q000008:administration & dosage / Q000266:history; D012998:Somalia / Q000453:epidemiology
chemical_list: D012900:Smallpox Vaccine