Smallpox is an acute contagious disease caused by variola virus, a member of the orthopoxvirus family.
Smallpox, which is believed to have originated over 3,000 years ago in India or Egypt, is one of the most devastating diseases known to ...
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Smallpox, which is believed to have originated over 3,000 years ago in India or Egypt, is one of the most devastating diseases known to ...
More Information