Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Emergence of Conjugative Multidrug-Resistant Pseudomonas aeruginosa

접합가능한다제내성녹농균의출현

  • Miyoung Lee (Department of Biomedical Laboratory Science, Daejeon Institute of Science and Technology)
  • 이미영 (대전과학기술대학교 임상병리과)
  • Received : 2023.08.16
  • Accepted : 2023.10.05
  • Published : 2023.12.28
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Abstract

The emergence and spread of multidrug-resistant Pseudomonas aeruginosa (MRPA) have become a serious problem worldwide. The involvement of metallo-β-lactamases (MBLs) in inducing carbapenem resistance is particularly acute. However, unlike other members of the Enterobacteriaceae genus, new clones of P. aeruginosa are constantly emerging and rapidly replacing previously prevalent dominant clones. Therefore, this study aimed to perform antimicrobial resistance gene analysis, integron gene cassette analysis using DNA sequencing, and plasmid transfer analysis by conjugation to investigate the antimicrobial resistance dynamics of 18 P. aeruginosa strains isolated from various medical samples at a general hospital in Busan from September 2017 to September 2019. All 18 strains showed extensively drug-resistant (XDR) phenotype and were resistant to most antibiotics, except colistin (100%) but were susceptible to aztreonam (22.2%) and ceftazidime (16.6%). Approximately 66.7% of the strains had Class 1 integrons showing various antimicrobial resistances. Notably, IMP-6 ST235 (66.7%), VIM-2 ST357 (16.7%), and IMP-1 ST446(16.7%) were identified. The identification of IMP-1-producing ST446, previously unreported in Korea, is noteworthy considering the emergence and prevalence of another MRPA high-risk clone.

다제내성 P. aeruginosa (MRPA)의 출현과 확산은 전 세계적으로 심각한 문제가 되었다. 특히 metallo-β-lactamases (MBLs)의 carbapenem 고도내성 관여 정도는 심각한 수준이며, 특히 P. aeruginosa는 장내세균 속 균종과는 달리 새로운 클론들이 지속적으로 나타나고 기존에 확산되었던 우세 클론을 대체하는 과정이 매우 빠르게 진행되고 있다. 이에 본 연구에서는 2017년 9월부터 2019년 9월까지 부산의 한 종합병원에서 다양한 의료용 시료로부터 분리된 18균주의 P. aeruginosa 균주에 대한 항균제 내성 유전자 분석과 DNA 염기서열 분석을 통한 Integron의 유전자 카세트 분석 및 접합에 의한 Plasmid 전달 분석을 수행하며 이에 대한 역학관계를 조사하고자 하였다. 18균주 모두 XDR 표현형을 보이는 균주였으며, Colistin(100%)을 제외한 대부분의 항생제에 내성을 나타냈으나, aztreonam(22.2%), ceftazidime(16.6%)에 일부 감수성을 보였다. 균주의 66.7%는 다양한 항균제 내성을 나타내는 Class1 integron을 가지고 있었으며, 접합에 의한 Plasmid전달도 성공적으로 이루어졌다(83.3%). 이는 이전의 장내세균에 대한 연구결과보다 25.8% 상향한 결과를 보여 공중보건에 대한 심각한 역학관점의 고찰을 필요로 한다. 특히, IMP-6 ST235 (66.7%)가 주를 이루며, VIM-2 ST357 (16.7), IMP-1 ST446 (16.7)이 확인되었다. 흥미롭게도, 국내에서는 아직까지 보고된 바가 없는 IMP-1 생성 ST446의 확인은 또 다른 MRPA 고위험 클론의 생성과 유행이라는 관점에서 주목할 만하다.

Keywords

Acknowledgement

This research was supported by the Daejeon Institute of Science and Technology.

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