Isolation of Rhodococcus equi from the feces of indigenous animals and soil from the Lower Zambezi National Park and Lochinvar National Park, Zambia

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  • TAKAI Shinji
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University
  • SYAKALIMA Michelo
    Department of Disease Control, School of Veterinary Medicine, University of Zambia
  • YASUDA Jun
    Veterinary Teaching Hospital, School of Veterinary Medicine, Faculty of Agriculture, Iwate University
  • SASAKI Yukako
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University
  • TSUTSUMI Hisako
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University
  • MIYAGAWA Emiko
    Department of Animal Hygiene, School of Veterinary Medicine and Animal Sciences, Kitasato University
  • WADA Kaya
    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
  • SUGIMOTO Chihiro
    National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine

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Rhodococcus equi is an important pathogen in foals; however, its incidence in African indigenous animals is poorly understood. Fecal samples (92 from nine indigenous species) and 43 soil samples were collected from two Zambian National Parks. The presence of R. equi was investigated and 533 isolates were tested for the presence of 15- to 17-kDa antigens (VapA) and a 20-kDa antigen (VapB) by immunoblotting and PCR. R. equi was isolated (102-104 colony forming units/g) from 75% of fecal and 74% of soil samples. Neither antigen was detected; however, about 20% of the isolates contained cryptic plasmids of various sizes. There was no evidence of virulent R. equi, but the avirulent form was widespread in the animals and the soil.<br>

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