Characterization of <i>Erysipelothrix Rhusiopathiae</i> Strains Isolated from Pigs Affected with Chronic Swine Erysipelas

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  • 慢性型豚丹毒発症豚から分離された豚丹毒菌の性状解析
  • マンセイガタ ブタ タンドク ハッショウ ブタ カラ ブンリ サレタ ブタ タンドクキン ノ セイジョウ カイセキ

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Abstract

<p>Swine erysipelas is an infectious disease caused by Erysipelothrix rhusiopathiae, and the live vaccine strain has been suspected of involvement in the onset of chronic cases. Of the 46 E. rhusiopathiae isolates from cases of chronic (arthritis and endocarditis) or subacute (urticaria) swine erysipelas at an abattoir, 32 were found to be vaccine strains and 14 were wild-type strains. Of the 32 vaccine strains, 5 were derived from cases of endocarditis and urticaria. PCR was used to identify the vaccine strains by detecting the single nucleotide polymorphisms (SNPs) of the vaccine strain. The method was found to be simple with easy judgement of positive and negative results. Sequence analysis of the 432 bp hypervariable region of the SpaA (surface protective antigen A) of the 14 wild-type strains identified two Met-203 type strains (serovar 1a), which are currently prevalent in Japan. The analysis also revealed that nine strains (serovar 2) displaying the same SNPs as the strains isolated in other prefectures, which might warrant further research on the epidemiological relationships between the strains. </p>

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