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In page Monkeypox:

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The virus was first discovered in monkeys (hence the name) in 1958, and in humans in 1970. Between 1970 and 1986, over 400 cases in humans were reported. Small viral outbreaks with a death rate in the range of 10% and a secondary human-to-human infection rate of about the same amount occur routinely in equatorial Central and West Africa.[2] The primary route of infection is thought to be contact with the infected animals or their bodily fluids.[2] The first reported outbreak outside of the African continent occurred in the United States in 2003 in the Midwestern states of Illinois, Indiana, and Wisconsin, with one occurrence in New Jersey. The outbreak was traced to a prairie dog infected from an imported Gambian pouch rat.[3] No deaths occurred.[4]