Simply begin typing or use the editing tools above to add to
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modifications will be sent to our editors for review. cause of
smallpox Smallpox is caused by infection with variola major, a
virus of the family Poxviridae. (A less-virulent form of
smallpox, called alastrim, is caused by a closely related virus
known as variola minor.) There are no natural animal carriers or
natural propagation of variola outside the human body. The
disease is thought by some scholars to have arisen among settled
agricultural populations in... What made you want to look up
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