Intestinal Spirochetosis in a 21-Month-Old Thoroughbred Colt.

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  • SHIBAHARA Tomoyuki
    Hokkaido Research Station, National Institute of Animal Health
  • KUWANO Atsutoshi
    Clinical Science and Pathobiology Division, Equine Research Institute, Japan Racing Association (JRA)
  • UENO Takanori
    Clinical Science and Pathobiology Division, Equine Research Institute, Japan Racing Association (JRA)
  • ANZAI Toru
    Epizootic Research Station, Equine Research Institute
  • KUWAMOTO Yasushi
    Epizootic Research Station, Equine Research Institute
  • SATO Hiroaki
    Hidaka Yearling Training Farm of Japan Racing Association
  • MAEDA Taiji
    Hokkaido Research Station, National Institute of Animal Health Nemuro Livestock Hygiene Service Center
  • ISHIKAWA Yoshiharu
    Hokkaido Research Station, National Institute of Animal Health
  • KADOTA Koichi
    Hokkaido Research Station, National Institute of Animal Health

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A 21-month-old Thoroughbred colt showed continuous diarrhea and developmental retardation for 7 months, and was thereafter subjected to euthanasia for necropsy and laboratory examinations. At necropsy, the cecal and colonic mucosae were diffusely rough and hyperemic. Histopathologically, the mucosa and submucosa were edematous and were infiltrated by numerous lymphocytes and macrophages. Meanwhile, three morphological types of Brachyspira antigen-containing spirochetes were found to be numerous in the crypts and in the mucus layer over the epithelium in the cecal and colonic lesions. They were frequently observed in intercellular gaps and in the cytoplasm of degenerative epithelial cells, and in the lamina propria, particularly in cavities around blood vessels. These invasive intestinal spirochetes might be one of pathogens inducing colitis and diarrhea in horses.

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