Smallpox: elimination or possible re-infection?
Raskin
S A
SA
D023482:Bioterrorism; D049671:History, 18th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans; D012899:Smallpox / Q000175:diagnosis / Q000266:history / Q000517:prevention & control* / Q000821:virology