Smallpox - Wikipedia
https://en.wikipedia.org/wiki/Smallpox
WEBSmallpox is caused by infection with variola virus, which belongs to the family Poxviridae, subfamily Chordopoxvirinae, genus Orthopoxvirus. Evolution. The date of the appearance of smallpox is not settled. It most probably evolved from a terrestrial African rodent virus between 68,000 and 16,000 years ago.
DA: 85 PA: 74 MOZ Rank: 61