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Smallpox

Smallpox (also known by the Latin names Variola or Variola vera) is a highly contagious disease unique to humans.

It is caused by two virus variants called Variola major and Variola minor.

V. major is the more deadly form, with a typical mortality of 20-40 percent of those infected.

Note:   The above text is excerpted from the Wikipedia article "Smallpox", which has been released under the GNU Free Documentation License.
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May 23, 2015

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updated 12:56 pm ET