Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Profiles of Enterotoxin Genes and Antimicrobial Resistance in Staphylococcus pseudintermedius Strains Isolated from Livestock and Companion Animals

  • Lee, Gi Yong (Department of Animal Science and Technology, Chung-Ang University) ;
  • Lee, Haeng Ho (Department of Animal Science and Technology, Chung-Ang University) ;
  • Um, Hong Sik (Department of Animal Science and Technology, Chung-Ang University) ;
  • Yang, Soo-Jin (Department of Animal Science and Technology, Chung-Ang University)
  • Received : 2019.10.21
  • Accepted : 2019.11.06
  • Published : 2019.12.30
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Abstract

Staphylococcus pseudintermedius is an opportunistic pathogen in dogs and is recognized as a zoonotic pathogen causing public health concern. Although canine-associated S. pseudintermedius has mainly been recognized for its antimicrobial resistance and ability to cause skin infections in dogs, information on antimicrobial resistance profiles and enterotoxigenicity of S. pseudintermedius in livestock is very limited. In this study, we investigated the prevalence of 18 different staphylococcal enterotoxin (SE) genes and toxic shock syndrome toxin gene (tst-1) in S. pseudintermedius strains isolated from dogs, pigs, and beef cattle. Moreover, antimicrobial resistance profiles of the strains were determined along with the presence of mecA and SCCmec types. Except for one bovine isolate, all S. pseudintermedius isolates from dogs and pigs were resistant to multiple drugs (≥ 4 different drugs). Four out of six canine isolates were methicillin resistant and carried SCCmec type V. In addition, 11 different SE genes (seb, sec, see, seg, sei, sej, sel, seo, sep, seq, and seu) and tst-1 were identified in S. pseudintermedius isolates from dogs, pigs, and beef cattle. Most S. pseudintermedius isolates (83%) harbored multiple SE genes, and sel (42%) and sep (42%) were most frequently detected in the isolates. Our results suggested that S. pseudintermedius isolates from livestock and companion animals may serve as a reservoir for SE genes and antimicrobial resistance.

Staphylococcus pseudintermedius는 개에서 기회감염을 유발하는 병원체이며, 공중보건학적으로도 주요한 인수공통 병원체이다. 개에서 분리된 S. pseudintermedius 균주들은 주로 항생제 내성 및 개에서 피부 감염을 유발하는 주요 원인균으로 연구되어 왔지만, 가축에서 분리된 S. pseudintermedius 균주들의 항생제 내성 및 장내 독소 생성에 대한 정보는 매우 제한적이다. 본 연구에서는 개, 돼지, 육우에서 분리된 S. pseudintermedius 균주들에서 18가지의 장내 독소 (staphylococcal enterotoxin; SE) 유전자와 toxic shock syndrome toxin 유전자(tst-1)의 분포양상을 조사하였다. 또한, S. pseudintermedius 균주들의 항생제 내성 양상과 더불어 mecA 유전자 및 SCCmec type 또한 확인하였다. 육우에서 분리한 하나의 균주를 제외한 모든 개와 돼지 분리주 들이 4개 이상의 항생제에 내성을 보였으며, 개에서 분리된 6개의 균주 중 4개의 S. pseudintermedius 균주들이 메티실린 내성과 더불어 SCCmec V를 가진 것으로 확인 되었다. 총 11개의 SE 유전자들 (seb, sec, see, seg, sei, sej, sel, seo, sep, seq, seu) 및 tst-1가 개, 돼지 및 육우로부터 분리된 S. pseudintermedius 균주들에서 확인 되었으며, 대부분의 분리주들 (83%)에서 2개 이상의 SE 유전자들이 확인 되었고, 그 중 sel (42%) 및 sep (42%)가 가장 빈번하게 검출 되었다. 본 연구를 통하여 반려견에서 뿐만 아니라 주요 가축에서 존재하는 S. pseudintermedius 균주들에서 높은 항생제 내성 양상을 확인 하였으며, 항생제 내성과 더불어 여러 staphylococcal enterotoxin 및 tst-1 유전자들을 전파할 가능성을 확인 하였다.

Keywords

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