CTX-M형 Extended-Spectrum -Lactamase 생성 Escherichia coli의 확산 및 CTX-M-12의 출현
Dissemination of CTX-M Type Extended-Spectrum β-Lactamases and Emergence of CTX-M-12 in Escherichia coli
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배경 : 국내에서 분리되는 Escherichia coli의 Ambler class Aextended-spectrum -lactamase (ESBL) 생성 현황을 알아보고자 하였다.방법: 2004년 2월부터 7월까지 전국 12개 병원에서 분리된cefotaxime 혹은 ceftazidime에 중간 혹은 내성인E. coli를 수 집하였다. 항균제 감수성은 디스크 확산법으로 시험하였고, ESBL생성은 double-disk synergy 시험으로 확인하였다. 한천희석법으로 -lactam 항균제의 최소억제 농도를 측정하였다. 중합연쇄반응으로 TEM형, SHV형, CTX-M형, PER-1형, VEB형, IBC형, GES형 및 TLA형 유전자를 검출하였고, 중합연쇄반응 산물의 염기서열을 양방향으로 분석하였다.결과: 국내 12개 병원에서 수집한 cefotaxime 혹은 ceftazidime에 중 간 혹 은 내 성 인E. coli의 90.9% (149/164)가 double-disksynergy 양성 소견을 보였다. E. coli에서 가장 흔한 Ambler classA ESBL은 CTX-M-15 (53주)와 CTX-M-14 (24주)였으며,CTX-M-3, CTX-M-9 및 CTX-M-12가 9주, 3주 및 3주 검출되었고, SHV-2a, SHV-12 및 TEM-52 유전자를 지닌 균주가CTX-M형 ESBL 확산 2571 주 , 5 주 및 3 주 검 출 되 었 다 . 결론: 본 연구를 통하여 CTX-M형 ESBL을 생성하는 E. coli가 국내에서 확산중이며 CTX-M-12 생성균주가 출현하였음을 확인할 수 있었다.
Abstract
Background : Clinical isolates of Escherichia coli were evaluated to determine the prevalence and genotypes of Ambler class A extended-spectrum -lactamases (ESBLs). Methods : Clinical isolates of E. coli were collected from 12 hospitals from February through July, 2004. Antimicrobial susceptibility was tested by disk diffusion and agar dilution methods, and ESBLproduction was determined by double-disk synergy test. TEM, SHV, CTX-M, PER-1, VEB, IBC, GES, and TLA type ESBL genes were detected by PCR amplifications, and the PCR products were subjected to direct sequencing. Results : The double-disk synergy test was positive in 90.9% (149 in 164) of the ceftazidime- or cefotaxime-resistant E. coli isolates. The most prevalent types of Ambler class A ESBLs in E. coli isolates were CTX-M-15 (n=53). CTX-M-14 (n=24), CTX-M-3 (n=9), CTX-M-9 (n=3), CTX-M-12 (n=3), SHV-2a (n=1), SHV-12 (n=5) and TEM-52 (n=3) were also found. CTX-M-12 ESBL had never been reported before in Korea. Conclusions : CTX-M type ESBL-producing E. coli isolates are spreading and CTX-M-12 is emerging in Korea.
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