Immunization against smallpox before Jenner.
D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D012899:Smallpox / Q000266:history; D012900:Smallpox Vaccine / Q000266:history*; D006113:United Kingdom; D014481:United States
D012900:Smallpox Vaccine