Survey of <i>Streptococcus equi</i> subsp. <i>equi</i> in Imported Draft Horses and SeM Genetic Analysis of Isolates

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  • 輸入肥育用馬における腺疫菌の保有状況調査及び分離菌株のSeM遺伝子解析
  • ユニュウ ヒイクヨウ バ ニ オケル センエキキン ノ ホユウ ジョウキョウ チョウサ オヨビ ブンリ キンカブ ノ SeM イデンシ カイセキ

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<p>Strangles, which is caused by Streptococcus equi subsp. equi, is an important commonly diagnosed bacterial infectious disease of equids worldwide. In the present study, we investigated the prevalence of S. equi in 1,303 imported draft horses quarantined at the Japanese border by the Animal Quarantine Service from 2019 to 2020. Eleven asymptomatic horses from France tested positive on rPCR. Three S. equi strains were isolated from three individuals. We performed SeM genetic analysis on these three strains, in addition to four other strains isolated from Canadian draft horses and a Belgian riding horse that were developing strangles. The two strains from the French isolates were classified into a new SeM allelic group (SeM-200). Molecular phylogenetic tree analysis suggested that the French and Belgian strains were closely related and classified into different clusters from the Canadian strains. This study identified asymptomatic carriers of strangles among imported draft horses.</p>

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