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This study evaluated the cynomolgus macaque as an animal model using the Machupo virus, Chicava strain, via intramuscular and aerosol challenge. The incubation period was 6 to 10 days with initial signs of depression, anorexia, diarrhea, mild fever, and a petechial skin rash. These were often followed by neurologic signs and death within an average of 18 days. Complete blood counts revealed leukopenia as well as marked thrombocytopenia. Serum chemistry values identified a decrease in total protein, marked increases in alanine aminotransferase and aspartate aminotransferase, and moderate increases in alkaline phosphatase. Gross pathology findings included a macular rash extending across the axillary and inguinal regions beginning at approximately 10 days postexposure as well as enlarged lymph nodes and spleen, enlarged and friable liver, and sporadic hemorrhages along the gastrointestinal mucosa and serosa. Histologic lesions consisted of foci of degeneration and necrosis\/apoptosis in the haired skin, liver, pancreas, adrenal glands, lymph nodes, tongue, esophagus, salivary glands, stomach, small intestine, and large intestine. Lymphohistiocytic interstitial pneumonia was also present. Inflammation within the central nervous system (nonsuppurative encephalitis) was histologically apparent approximately 16 days postexposure and was generally progressive. This study provides insight into the course of Machupo virus infection in cynomolgus macaques and supports the usefulness of cynomolgus macaques as a viable model of human Machupo virus infection.<\/jats:p>","DOI":"10.1177\/0300985814540544","type":"journal-article","created":{"date-parts":[[2014,7,3]],"date-time":"2014-07-03T04:19:26Z","timestamp":1404361166000},"page":"26-37","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":27,"title":["Pathology of Experimental Machupo Virus Infection, Chicava Strain, in Cynomolgus Macaques (\n                    <i>Macaca fascicularis<\/i>\n                    ) by Intramuscular and Aerosol Exposure"],"prefix":"10.1177","volume":"52","author":[{"given":"T. M.","family":"Bell","sequence":"first","affiliation":[{"name":"US Army Medical Research Institute of Infectious Diseases (USAMRIID), Frederick, MD, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. 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