Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Distribution Characteristics and Antibiotics Resistance of Enterococcus spp. in Nakdong River

낙동강에서 엔테로코커스의 분포특성 및 항생제별 내성률

  • Seong, Jin-Uk (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Cha, Soon-Bae (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Ryu, Kwang-Hyun (Department of Laboratory Medicine, Samsung Medical Center) ;
  • Choi, Kwang-Soon (K-Water Research Institute) ;
  • Park, Je-Chul (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 성진욱 (금오공과대학교 환경공학과) ;
  • 차순배 (금오공과대학교 환경공학과) ;
  • 유광현 (삼성서울병원 진단검사의학과) ;
  • 최광순 (K-water 연구원) ;
  • 박제철 (금오공과대학교 환경공학과)
  • Received : 2013.02.22
  • Accepted : 2013.06.28
  • Published : 2013.09.30
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Abstract

This study was it conducted on effluent or river water close to discharge locations from a treatment plant, which were analyzed for the presence, phenotype and antibiotic resistance rates of Vancomycin Resistant Enterococci (VRE). The test results for isolation and identification of Enterococcus spp. showed that they all were VRE positive, with a total of 32 strains detected. Multiplex PCR was conducted for 32 strains, each of which were identified as E. faecium, and the results indicated that they were all confirmed as VRE, corresponding to the Van A phenotype. The results of E. faecium concentrations measured at various locations indicated that they were, on average, higher at the location of sewage treatment plants. The frequency of positive tests as well as the number of colonies was higher downstream of treatment plants. The minimum inhibitory concentration was inspected for 26 strains of discharged water samples from sewage water treatment plants, and 6 strains of river samples. Out of 19 antibiotics, 14 and 5 species showed resistance and sensitivity, respectively.

본 연구는 하수 및 가축분뇨 처리장 방류수, 하천수를 이용하여 반코마이신 내성 장구균(Vancomycin Resistant Enterococci, VRE)의 검출여부를 확인하고 검출된 장구균의 표현형을 분석함으로써 하천에 대한 공공처리시설의 방류수에 포함되어있는 엔테로코커스의 영향을 파악하여 항생제 내성균이 환경에 미치는 영향 및 항생제 내성 연구에 기초 자료가 되고자 하였다. 엔테로코커스의 동정시험 결과 모두 32균주가 검출되었고 이는 모두 E. faecium으로 동정되었다. Multiplex PCR 시행한 결과 32균주 모두 Van A 표현형에 해당하는 반코마이신 내성 장구균으로 확인되었다. 조사지점별 세균의 E. faecium 집락수의 측정 결과 하수처리장 지역에서 평균적으로 가장 높게 나타났고, 하천 지역의 경우 상류지점에서 하류 지점으로 갈수록 세균의 colony 숫자도 늘어나는 것으로 조사되었다. 하수처리장 방류수 시료 26균주에 대한 최소억제농도 검사 결과, 19개의 항생제 중 내성, 감수성을 보인항생제 수는 각각 14, 5종으로 내성을 보이는 항생제의 수가 약 70% 이상으로 대부분을 차지하였다. 하천 시료 6균주에 대한 최소억제농도 검사 결과, 19개의 항생제 중 내성, 감수성을 보인 항생제 수는 각각 14, 5종으로 내성을 보이는 항생제의 수가 약 70% 이상으로 대부분을 차지하여 하수처리장 방류수 시료의 검사 결과와 동일하였다.

Keywords

References

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