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Pathologic and molecular characterization of Streptococcus dysgalactiae subspecies equisimilis infection in neonatal piglets
Sang-Ik Oh1,2, Jong Wan Kim1, Ji-Youl Jung1, Myeongju Chae1, Yu-Ran Lee1, Jong Ho Kim1, ByungJae So1, Ha-Young Kim1,*
1Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea
2Animal Disease & Biosecurity Team, National Institute of Animal Science, Wanju 55365, Korea
Correspondence to: Tel: +82-54-912-0491; Fax: +82-54-912-0499; E-mail: kimhy@korea.kr
Received: September 21, 2017; Revised: December 4, 2017; Accepted: December 26, 2017; Published online: December 28, 2017.
Streptococcus dysgalactiae subspecies equisimilis (SDSE) is an emerging pathogen in animals and humans. Here, we describe two clinical swine cases of SDSE infection presenting with lameness, neurological signs, or sudden death. Pathological examination indicated suppurative arthritis, encephalitis, and multifocal abscesses in the kidney and heart. β-hemolytic colonies from the joint samples of each case were identified as SDSE. The isolates showed low minimum inhibitory concentration values for β-lactams and presented the same virulence gene profile (slo-/sagA+/pSTKP8+). Molecular analysis by multilocus sequence typing revealed SDSE isolates from case 1 and 2 as sequence type 315 and 252, respectively.
Keywords: antimicrobial susceptibility; multilocus sequence typing; piglet; Streptococcus dysgalactiae subspecies equisimilis

© 2017 The Korean Society of Veterinary Science.