Epidemiological Survey of Bovine Viral Diarrhea Virus Isolated from the Offspring of Cows Moved to an Another Prefecture and the Eradication Efforts in Tottori Prefecture

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  • MASUDA Tsuneyuki
    Tottori Prefecture Kurayoshi Livestock Hygiene Service Center
  • KURODA Moegi
    Tottori Prefecture Kurayoshi Livestock Hygiene Service Center
  • IWAO Ken
    Tottori Prefecture Seibu Livestock Hygiene Service Center
  • IKEMOTO Chiemi
    Tottori Prefecture Seibu Livestock Hygiene Service Center
  • KODANI Michiko
    Tottori Prefecture Department of Agriculture
  • MASUDA Yasumitsu
    Rearing Improvement Laboratory, Tottori Prefecture Livestock Research Center
  • KAMEYAMA Ken-ichiro
    Viral Diseases and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization
  • SAKODA Yoshihiro
    Laboratory of Microbiology, Graduate School of Veterinary Medicine, Hokkaido University

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Other Title
  • 県外預託牛の産子から分離された牛ウイルス性下痢ウイルスの疫学調査とその清浄化に向けた取組み
  • ケンガイ ヨタクギュウ ノ サンコ カラ ブンリ サレタ ギュウ ウイルスセイ ゲリ ウイルス ノ エキガク チョウサ ト ソノ セイジョウカ ニ ムケタ トリクミ

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Abstract

<p>Since 2012, efforts toward the eradication of bovine viral diarrhea virus (BVDV) have been undertaken in Tottori Prefecture because many persistently infected (PI) cows have been detected. In 2016, six PI cows had been detected on three farms in Tottori Prefecture between January and October. An epidemiological survey revealed that the inseminated dams of the six PI cows had been moved to the same ranch outside Tottori Prefecture during approximately the same period. Using phylogenetic analysis of the 1122-base pair E2 gene sequence of BVDV isolated from five of the six PI cows, all five isolates were classified as BVDV-1c, with high nucleotide sequence homology (99.6‐99.9%). These results suggest that the dams of the six PI cows were infected with BVDV-1c during the insemination period and then gave birth to PI cows after returning to Tottori Prefecture. As the route of invasion for PI offspring through inseminated cows moved to another prefecture demonstrated, BVDV eradication will require both local and interregional efforts.</p>

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