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A skin lession caused by the monkeypox virus is shown on the hand of a child infected with the virus two weeks after being bit by a prairie dog in Wisconsin in this May, 27, 2003 photo. Federal health officials investigating an outbreak of monkeypox that apparently spread from pet prairie dogs to people in three Midwestern states said Monday, June 9, 2003, that the number of possible cases has risen to at least 33. (KEYSTONE/AP Photo/Marshfield Clinic) === ===