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A Multiplex Polymerase Chain Reaction for Discriminating Erysipelothrix Rhusiopathiae from Erysipelothrix Tonsillarum

Erysipelothrix rhusiopathiae is the causative agent of swine erysipelas, and it causes great economic losses in Japan and worldwide. In meat inspection, it is very important to distinguish E. rhusiopathiae from other bacteria showing similar clinical signs of disease or similar bacterial characteristics. To distinguish E. rhusiopathiae from Erysipelothrix tonsillarum, 2 polymerase chain reaction (PCR) systems were combined. The primer sets ERY-1F and ERY-2R were designed to amplify 2,210 base pairs (bp) of nucleotide sequence specific for E. rhusiopathiae chromosomal DNA, and the primer sets MO101 and ERS-1R were designed to amplify 719 bp of nucleotide sequence including a highly conserved region of genus Erysipelothrix 16S rRNA. Two fragments were amplified when E. rhusiopathiae was used as the PCR template using the primer sets, whereas a single fragment was amplified when E. tonsillarum was used as the template.