Rhodococcus equi in the Soil Environment of Horses in Inner Mongolia, China

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  • TAKAI Shinji
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University
  • ZHUANG Ding
    Department of Preventive Veterinary Medicine, College of Animal and Veterinary Science, Jilin University
  • HUO Xiao-wei
    College of Animal Science and Technology, Inner Mongolia University for the Nationalities
  • MADARAME Hiroo
    Veterinary Teaching Hospital, Azabu University
  • GAO Ming-hua
    ZhaLanTun School of Agriculture and Animal Husbandry
  • TAN Zhong-tian
    ManZhouLi City Veterinary Station
  • GAO Shuang-cheng
    ChenQi Veterinary Station
  • YAN Li-jun
    Wulagai Veterinary Station of Xilin Goler Meng, Inner Mongolia
  • GUO Chun-mei
    Wulagai Veterinary Station of Xilin Goler Meng, Inner Mongolia
  • ZHOU Xue-feng
    Wulagai Veterinary Station of Xilin Goler Meng, Inner Mongolia
  • HATORI Fumiko
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University
  • SASAKI Yukako
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University
  • KAKUDA Tsutomu
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University
  • TSUBAKI Shiro
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University

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  • 中国・内蒙古自治区の馬飼育環境土壌中のRhodococcus equi

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Abstract

Little is known about the distribution of Rhodococcus equi in the soil environment of native horses in China. One hundred and eight soil samples were collected from native-horse farms in the Hulun Beier grasslands of eastern Mongolia, the Xilin Goler grasslands of southern Mongolia, and Tongliao City in Inner Mongolia, China. The isolation rates of R. equi from soil samples from the Hulun Beier and Xilin Goler grasslands ranged from 25.9% to 30.0%. In contrast, isolation rates from soil samples from Tongliao City were as high as 82.3% and the mean number of R. equi in soil samples from Tongliao City was 10 times more than those of samples from the grasslands. The 488 isolates were examined using PCR for the presence of genes that encode virulence-associated 15-17 kDa antigen protein (VapA) and the 20 kDa antigen protein (VapB). All isolates were negative for virulence-associated proteins. Plasmid profiles of these avirulent isolates showed that cryptic plasmids of various sizes were present with an incidence of 13.3% to 21.5%. The results of the present study contrast with those of our recent study (J. Vet. Med. Sci. 67:611-613, 2005), in which we reported that R. equi was absent from Mongolian horses in Ulaanbaatar, Mongolia. It is suggested that the difference between the results of these two studies is due to the mobile pasturing system in Mongolia and nonmobile pasturing system in Inner Mongolia.<br>

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