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Open Access Meningoencephalitis Due to Listeria monocytogenes in a Pregnant Rhesus Macaque (Macaca mulatta)

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We here report a spontaneous case of meningoencephalitis due to Listeria monocytogenes in an adult primiparous rhesus macaque (Macaca mulatta) during an outbreak of listeriosis in an outdoor enclosure. Clinical signs included tremors, abnormal posture, and altered mental status. Hematology and analyses of cerebrospinal fluid were consistent with bacterial infection. Pure cultures of L. monocytogenes were recovered from the placenta–abortus, cerebrospinal fluid, and brain tissue. The macaque did not respond to treatment and was euthanized. Histopathologic examination of the brain revealed acute meningoencephalitis. This case represents an unusual clinical and pathologic presentation of listeriosis in a nonhuman primate in which the dam and fetus both were affected.

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Document Type: Case Report

Affiliations: 1: Department of Primate Medicine, California National Primate Center, University of California, Davis, California, USA. [email protected] 2: Department of Primate Medicine, California National Primate Center, University of California, Davis, California, USA 3: Department of Pathology, California National Primate Center, University of California, Davis, California, USA 4: Department of Neurology, VCA, Animal Care Center of Sonoma County, Rhonert Park, California, USA

Publication date: October 1, 2012

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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