Epidemiological Analysis Based on Phylogenetic Tree of Bovine Viral Diarrhea Viruses Isolated from Cattle in Tochigi Prefecture, Japan

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  • 栃木県における牛ウイルス性下痢ウイルスの分子系統樹を利用した疫学解析
  • トチギケン ニ オケル ウシ ウイルスセイ ゲリ ウイルス ノ ブンシ ケイトウジュ オ リヨウ シタ エキガク カイセキ

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Abstract

Bovine viral diarrhea viruses (BVDV) 21, 27, 11, and 4 of the 63 strain isolated between 1989 and 2007 in Tochigi Prefecture, Japan were classified into genotype 1a, 1b, 1c, and 2a, respectively, through phylogenetic analysis of 327bp of their E2 gene sequences. There was a high homology of 99.0% to 100% in the phylogenetic tree of 663bp of the E2 gene sequences of the BVDV which were isolated in cattle bred on farms which use the public ranch. These results suggest that the spread of BVDV through the public ranch is one of the main routes for the spread of BVDV in Tochigi Prefecture. The BVDV inspection which we performed on pastured cattle prevented cattle persistently infected with BVDV from pasturing on a public ranch, and kept BVDV from spreading through the ranches in Tochigi Prefecture. The BVDV inspection is therefore thought to be a useful method for preventing the spread of BVDV.

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