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Smallpox was caused by either of two virus variants, ''Variola major'' or ''Variola minor.'' There is a link below to an article on smallpox.

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13y ago
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13y ago

Dr. A.R. Campbell discovered that Smallpox was spread through bedbugs and was caused by the poxvirus variola (major and minor).

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Q: What are the microorganism responsible for smallpox?
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