What is Smallpox
Smallpox (also known by the Latin names Variola or Variola vera) was a highly contagious viral disease unique to humans. It is caused by two virus variants called Variola major ...
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Smallpox (also known by the Latin names Variola or Variola vera) was a highly contagious viral disease unique to humans. It is caused by two virus variants called Variola major ...

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