The history of smallpox eradication.
D000349:Africa; D049672:History, 19th Century; D049673:History, 20th Century; D012899:Smallpox / Q000266:history* / Q000517:prevention & control; D012900:Smallpox Vaccine; D014611:Vaccination / Q000266:history; D014944:World Health Organization
D012900:Smallpox Vaccine