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분자학적 방법을 이용한 Carbapenemase-Producing Klebsiella oxytoca 검출

Carbapenemase-Producing Klebsiella oxytoca Detection Using Molecular Methods

박지애|양병선
대한임상검사과학회 (Korean Society for Clinical Laboratory Science)|2019.12|대한임상검사과학회지 (Korean Journal of Clinical Laboratory Science)|제51권 제4호|pp. 428-435|DOI 10.15324/kjcls.2019.51.4.428

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Klebsiella oxytocaCarbapenem-resistant EnterobacteriaceaeKlebsiella pneumoniae carbapenemase
주제분류기타자연과학

초록

Klebsiella pneumoniae carbapenemase (KPC)와 같은carbapenem 분해효소의 급속한 증가와 보급은 의료 관련 감염 분야 내에서 주요한 문제가 되었다. Carbapenemresistant Enterobacteriaceae (CRE) 감염을 치료하기 위한항생제는 거의 없으므로 내성의 박테리아 메커니즘의 확인은 감염 통제와 역학 연구에 매우 중요하다. 그러므로 KPC 균주를 검출하는 신속하고 효과적인 방법은 치료상의 실패를 피하고, 이러한 다제 내성세균의 유통을 방지 및 통제하는 대책으로 도입할 필요가 있다. 분석에 이용한 31균주에서 Acinetobacter spp. 7균주, Morganella morganii 6균주, Pseudomonas aeruginosa 5균주, Proteus mirabilis 5균주, Proteus vulgaris 1균주, Enterobacter cloacae 2균주, Enterobacter aerogenes 1균주, Klebsiella pneumoniae 1균주, Klebsiella oxytoca 1균주, Serratia marcescens 1균주, Escherichia coli 1균주를 확인하였다. 그람음성 간균이 분리된 검체의 빈도는 urine (35.5%), blood (19.4%), sputum (16.1%), pus (9.7%), ascitic fluid (9.7%), tracheal aspirates (6.5%), bile juice (3.2%) 순으로 나타났다. PCR 방법을 이용한 유전자분석 결과blaIMP, blaVIM, blaOXA-48 에서는 증폭이 확인된 균주가 없었으나, Klebsiella oxytoca 1 균주에서 blaKPC 유전자를 확인하였다. 결론적으로, PCR 방법을 이용한 진단법은 KPC를 정확하고신속하게 진단할 수 있으며, 그로 인해 병원 내 KPC의 전파방지를 위한 신속한 예방대책 수립이 가능하다 할 수 있다.

Abstract

The rapid increase and dissemination of carbapene mases, such as Klebsiella pneumoniae carbapenemase (KPC), has become a major problem within the field of healthcare-related infection. There are few antibiotics to treat carbapenem-resistant Enterobacteriaceae (CRE) infections, so the identification of resistant bacterial mechanisms is critical to initiate infection control and conduct epidemiological research. A rapid and effective method for detecting KPC-producing bacteria is needed to avoid therapeutic failures and introduce measures to prevent and control the dissemination of these multi-resistant bacteria. During the study period, 31 isolates (seven isolates of Acinetobacter spp., six isolates of Morganella morganii, five isolates of Pseudomonas aeruginosa, five isolates of Proteus mirabilis, one isolate of Proteus vulgaris, two isolates of Enterobacter cloacae, one isolate of Enterobacter aerogenes, one isolate of Klebsiella pneumoniae, one isolate of Klebsiella oxytoca, one isolate of Serratia marcescens and one isolate of Escherichia coli) were identified by the VITEK. Gram negative rod bacteria were the most frequently isolated from urine (35.5%), blood (19.4%), sputum (16.1%), pus (9.7%), ascitic fluid (9.7%), tracheal aspirates (6.5%) and bile juice (3.2%). Analysis using the PCR method identified the blaKPC gene in the K. oxytoca1 strain, but the blaIMP, blaVIM and blaOXA-48 genes are not amplified. In conclusion, diagnosis using the PCR method can accurately and quickly diagnose KPC, thus establishing quick preventive measures to prevent the spread of KPC in hospitals.

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