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| | eMedicine - Poxviruses : Article Excerpt by: John D Shanley, MD |
 | | The orthopoxviruses include smallpox (variola), monkeypox, vaccinia, cowpox, buffalopox, cantagalo, and aracatuba viruses. |
 | | The origins of vaccinia virus remain unknown, but this virus is distinct from both variola and cowpox. |
 | | Vaccinia virus has recently been shown to be closely related to the New World orthopox viruses, cantagalo, and aracatuba viruses. |
| www.emedicine.com /med/byname/poxviruses.htm (646 words) |
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