Epidemiological Survey of Theileria orientalis Infection in Grazing Cattle in the Eastern Part of Hokkaido, Japan

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  • OTA Naomi
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine
  • MIZUNO Daisuke
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine
  • KUBOKI Noritaka
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine
  • IGARASHI Ikuo
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine
  • NAKAMURA Yukio
    Nakamura Domestic Animal Clinic
  • YAMASHINA Hidenari
    Hokkaido Agricultural Developmental Corporation
  • HANZAIKE Teruko
    Hokkaido Tokachi Livestock Hygiene Service Center
  • FUJII Kei
    Hokkaido Animal Research Center
  • ONOE Sadao
    Hokkaido Animal Research Center
  • HATA Hiroshi
    Field Science Center for Northern Biosphere, Hokkaido University
  • KONDO Seiji
    Field Science Center for Northern Biosphere, Hokkaido University
  • MATSUI Shirou
    The National Livestock Breeding Center
  • KOGA Masao
    The National Livestock Breeding Center
  • MATSUMOTO Kotaro
    Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
  • INOKUMA Hisashi
    Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
  • YOKOYAMA Naoaki
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine

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Other Title
  • Parasitology: Epidemiological survey of Theileria orientalis infection in grazing cattle in the eastern part of Hokkaido, Japan
  • Epidemiological survey of Theileria orientalis infection in grazing cattle in the eastern part of Hokkaido

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Abstract

Theileria orientalis is one of the benign species of Theileria that is widely distributed in Japan and is sometimes responsible for serious economic losses in the livestock industry. In the present study, we surveyed the current status of T. orientalis infection in grazing cattle in the eastern areas of Hokkaido (Taiki, Otofuke, Shintoku, and Shin-Hidaka districts) using molecular methods, as well as traditional methods, of diagnosis. The genes encoding the major piroplasm surface protein (MPSP) and p23 of T. orientalis were identified using highly detectable polymerase chain reaction (PCR). Results of the MPSP-PCR assay indicated that grazing cattle in these districts, after about 1.5 months pasturage, showed high rates of infection, ranging from 10.0-64.8%. Although the main MPSP and p23 genotypes detected were the Ikeda- or Chitose-types, an MPSP gene closely relating to that found in Okinawa prefecture, and a p23 gene closely relating to the Australian (Warwick) Buffeli-type gene, were found in the cattle in Shintoku and Shin-Hidaka districts. The present survey indicated that there were at least five types of T. orientalis classified by their MPSP genes in Hokkaido, Japan, and that T. orientalis infection rates are still high in this region.<br>

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