Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Biofilm Formation, Antimicrobial Peptide Resistance, and Hydrogen Peroxide Resistance in Livestock-Associated Staphylococcus aureus Isolates

  • Lee, Gi Yong (Department of Animal Science and Technology, Chung-Ang University) ;
  • Kim, Sun Do (Department of Animal Science and Technology, Chung-Ang University) ;
  • Yang, Soo-Jin (Department of Animal Science and Technology, Chung-Ang University)
  • Received : 2020.05.14
  • Accepted : 2020.07.09
  • Published : 2020.08.30
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Abstract

Human infections with livestock-associated methicillin-resistant/-susceptible Staphylococcus aureus (LA-MRSA/LA-MSSA) have recently been increasing significantly. These LA-MRSA and LA-MSSA strains can be transmitted to individuals who have frequent contact with livestock animals and foods of animal origin. In this study, major virulence potentials of S. aureus such as biofilm formation, antimicrobial peptide resistance, and in vitro hydrogen peroxide (H2O2) resistance were assessed using 20 MRSA and MSSA strains isolated from raw milk, beef cattle, and workers in the livestock industry. Static biofilm formation assays revealed that there is no difference in levels of biofilm production between MRSA versus MSSA or bovine- versus human-associated strains. In vitro BMAP (bovine myeloid antimicrobial peptide)-28 susceptibility assays also revealed no difference in the resistance to the antimicrobial peptide between MRSA versus MSSA or bovine- versus human-associated S. aureus strains. However, LA-MRSA strains displayed increased resistance to H2O2, which may play an important role in survival and dissemination of the pathogen in livestock. These results provide an important basis for understanding pathogenic potentials of LA-MRSA and LA-MSSA strains in human and animal hosts.

최근 가축에서 유래된 메티실린에 내성이 있는 황색포도상구균과 감수성을 보이는 황색포도상구균(LA-MRSA/LA-MSSA)에 의한 사람의 감염증이 증가하는 추세이다. 이러한 LA-MRSA 및 LA-MSSA균주는 가축을 비롯한 축산업에 종사하는 사람들에게 전파가 이루어질 수 있다. 본 연구에서는 원유, 육우, 축산 종사자에서 분리된 20개의 MRSA 및 MSSA 균주를 이용하여 생물막 형성, 항균 펩타이드에 대한 저항성 및 과산화수소 저항성과 같은 황색포도상구균의 주요 병원성 인자를 평가하였다. 생물막 형성 실험에서는 MRSA와 MSSA간의 차이는 없었으며, 동물 유래 분리주와 사람 유래 분리주들 간의 비교에서도 차이가 없음이 확인되었다. BMAP-28에 대한 감수성 시험 결과 MRSA-MSSA 또는 동물 분리-사람 분리 간의 차이가 없음을 확인하였다. 생물막 형성과 BMAP-28 감수성과는 달리, 원유에서 분리된 MRSA 균주들의 H2O2에 대한 내성 증가가 확인 되었다. 본 연구를 통하여 가축 및 축산업 종사자에서 분리된 LA-MRSA와 LA-MSSA 균주의 주요 병원성 인자를 확인하였으며, 숙주 및 환경에서의 생존과 전파 가능성을 이해하는데 기초 자료로 활용 될 수 있을 것이다.

Keywords

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