Survey on Tick-Borne Pathogens in Thoroughbred Horses in the Hidaka District, Hokkaido, Japan

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  • YBAÑEZ Adrian Patalinghug
    United Graduate School of Veterinary Sciences, Gifu University, Gifu 501–1193, Japan Department of Veterinary Clinical Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080–8555, Japan
  • SATO Fumio
    Hidaka Training and Research Center, Japan Racing Association, Urakawa, Hokkaido 057–0171, Japan
  • NAMBO Yasuo
    Hidaka Training and Research Center, Japan Racing Association, Urakawa, Hokkaido 057–0171, Japan
  • FUKUI Takashi
    Faculty of Pharmacy, Chiba Institute of Science, Choshi, Chiba 288–0025, Japan
  • MASUZAWA Toshiyuki
    Faculty of Pharmacy, Chiba Institute of Science, Choshi, Chiba 288–0025, Japan
  • OHASHI Norio
    Department of Microbiology, Shizuoka Institute of Environment and Hygiene, Shizuoka 420–8637, Japan
  • MATSUMOTO Kotaro
    Department of Veterinary Clinical Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080–8555, Japan
  • KISHIMOTO Toshio
    Okayama Prefectural Institute for Environmental Science and Public Health, Okayama 701–0298, Japan
  • INOKUMA Hisashi
    United Graduate School of Veterinary Sciences, Gifu University, Gifu 501–1193, Japan Department of Veterinary Clinical Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080–8555, Japan

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A total of 87 Thoroughbred horses and 10 ixodid ticks from a ranch in Hidaka district, Hokkaido were tested for tick-borne diseases. Using the indirect fluorescent antibody (IFA) method, 3.4, 92.0 and 97.7% of the horses showed antibody titers of ≥80 against Anaplasma phagocytophilum, Rickettsia helvetica, and Borrelia garinii, respectively. This is the first report of infection with the 3 pathogens in horses in Japan. Using PCR, DNAs from the peripheral blood of all horses were found negative with any Anaplasma, Rickettsia and Borrelia spp., while those from Haemaphysalis megaspinosa ticks were found positive for Anaplasma sp. closely related to A. phagocytophilum in Japan, and A. bovis. B. japonica was also detected in an H. flava tick for the first time.

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