From http://en.wikipedia.org/wiki/Smallpox http://en.wikipedia.org/wiki/Smallpox : During the 20th century, it is estimated that smallpox was responsible for 30

From http://en.wikipedia.org/wiki/Smallpox http://en.wikipedia.org/wiki/Smallpox : During the 20th century, it is estimated that smallpox was responsible for 300–500 million deaths. Smallpox has been around for over 10,000 years. In the 20th century it killed more people than all the wars in this list: http://en.wikipedia.org/wiki/War#List_of_wars_by_death_toll http://en.wikipedia.org/wiki/War#List_of_wars_by_death_toll