Spontaneous Yersiniosis Due to Yersinia pseudotuberculosis Serotype 7 in a Squirrel Monkey

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  • NAKAMURA Shin-ichi
    Laboratory of Veterinary Pathology, Azabu University
  • HAYASHIDANI Hideki
    Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
  • IWATA Taketoshi
    Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
  • TAKADA Mariko
    Uminonakamichi Seaside Park Administration
  • UNE Yumi
    Laboratory of Veterinary Pathology, Azabu University

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  • Pathology: Spontaneous yersiniosis due to Yersinia pseudotuberculosis serotype 7 in a squirrel monkey

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Abstract

A captive male Bolivian squirrel monkey (Saimiri boliviensis) of less than 1 year of age died following diarrhea and debilitation on the day of death. At necropsy, necrotizing enteritis accompanied with enlarged Peyer's patches, solitary lymphatic follicles and mesenteric lymph nodes, and multiple yellowish-white nodules in the spleen and liver were found. Histopathologically, these lesions were necrotizing inflammation containing Gram-negative bacilli. Yersinia pseudotuberculosis serotype 7 was isolated from the spleen and liver. The virF gene, which is an essential virulent plasimid (pYV) in pathogenic Y. pseudotuberculosis isolates, and the ypmA gene, which is a superantigenic toxin, were detected in the isolates. This is the first report of a fatal case of Yersinia pseudotuberculosis 7 infection in the world.<br>

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