title: Smallpox: a disease that disappeared.
mesh_terms: D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D049691:History, Medieval; D006801:Humans; D012899:Smallpox / Q000266:history* / Q000517:prevention & control; D014611:Vaccination / Q000266:history