Definitions for orthopoxvirus
Any of the genus Orthopoxvirus of poxviruses, including smallpox and many species isolated from mammals.
Origin: From the genus name.
U.S. National Library of Medicine
A genus of the family POXVIRIDAE, subfamily CHORDOPOXVIRINAE, comprising many species infecting mammals. Viruses of this genus cause generalized infections and a rash in some hosts. The type species is VACCINIA VIRUS.
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