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In page Cowpox:

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The virus is found in Europe, and mainly in the UK. Human cases today are very rare and most often contracted from domestic cats. The virus is not commonly found in cattle; the reservoir hosts for the virus are woodland rodents, particularly voles. From these rodents, domestic cats contract and transmit the virus to humans.[2] Symptoms in cats include lesions on the face, neck, forelimbs, and paws, and less commonly upper respiratory tract infections.[3] Symptoms of infection with cowpox virus in humans are localized, pustular lesions generally found on the hands and limited to the site of introduction.[4] The incubation period is 9 to 10 days.[citation needed] The virus is prevalent in late summer and autumn.[5]