1721 Boston smallpox outbreakW
1721 Boston smallpox outbreak
1896 Gloucester smallpox epidemicW
1896 Gloucester smallpox epidemic
Soviet biological weapons programW
Soviet biological weapons program
1972 Yugoslav smallpox outbreakW
1972 Yugoslav smallpox outbreak
1978 smallpox outbreak in the United KingdomW
1978 smallpox outbreak in the United Kingdom
Antonine PlagueW
Antonine Plague
Bradford smallpox outbreak of 1962W
Bradford smallpox outbreak of 1962
1775–1782 North American smallpox epidemicW
1775–1782 North American smallpox epidemic