First Case of Echinococcus multilocularis Infection in a Zoo-Housed Flying Squirrel (Pteromys volans orii)

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  • OIKAWA Eri
    Division of Pathobiological Science, Department of Basic Veterinary Medicine Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080–8555, Japan
  • SHIMURA Ryoji
    Kushiro City Zoo, Kushiro 085–0201, Japan
  • NISHIMURA Maki
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080–8555, Japan
  • FURUOKA Hidefumi
    Division of Pathobiological Science, Department of Basic Veterinary Medicine Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080–8555, Japan

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  • First Case of <i>Echinococcus multilocularis</i> Infection in a Zoo-Housed Flying Squirrel (<i>Pteromys volans orii</i>)

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A 33 month-old male flying squirrel kept in a zoo developed progressive dyspnea and died. Macroscopically, the liver and lung were enlarged with numerous nodular vesicles. Histologically, these organs were replaced by numerous collapsed vesicles demarcated by fibrous tissues. The cysts lined by a cellular, germinal layer contained numerous brood capsules with abundant production of well-developed protoscolices. Protoscolices were about 80–100 μm in diameter, and had hooks being visible as refractive structures. This zoo locates in the east of Hokkaido where is an endemic area of Echinococcus multilocularis infection. From epidemiology and pathological findings, this animal was diagnosed as E.multilocularis infection. This report describes the pathology of the first case of E. multilocularis infection in a flying squirrel.

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