长沙地区产金属β-内酰胺酶铜绿假单胞菌的分子流行病学特征

摘要

目的：了解长沙地区多重耐药铜绿假单胞菌（PA）产金属β-内酰胺酶（MBL）菌株基因型和流行情况。方法收集该地区7所综合医院临床分离的 PA，对菌株进行鉴定和药敏试验，采用 EDTA 协同试验、E-test MBL进行 MBL 表型筛选，聚合酶连反应（PCR）明确其基因型，肠杆菌科基因间重复序列聚合酶链反应（ERIC-PCR）进行同源性分析。结果经 EDTA 协同和 E-test MBL 初步筛查，81株 PA 中仅10株为强阳性；PCR 结果显示，18株 PA MBL 基因阳性，其中 IMP-9型11株，IMP-1型1株和 VIM-2型6株，未检测出 SIM、SPM、GIM 和NDM-1基因型。ERIC-PCR 分型结果显示，12株产 IMP PA 存在多个型别，而6株产 VIM-2菌株为同一型别。结论长沙地区多重耐药 PA 以 IMP-9和VIM-2基因型最常见。%Objective To investigate the genotypes and epidemic of metallo-β-lactamase-(MBL )-producing Pseudomonas aeruginosa (P .aeruginosa)in Changsha.Methods P .aeruginosa isolated from seven comprehensive hospitals in Changsha were collected and performed identification and antimicrobial susceptibility testing,pheno-types of MBL were detected with EDTA-disk synergy test and E-test,genotypes were determined by polymerase chain reaction (PCR),homology analysis were conducted by enterobacterial repetitive intergenic consensus PCR (ERIC-PCR).Results Preliminary screening by EDTA-disk synergy test and E-test showed that only 10 of 81 iso-lates were strong positive;PCR result showed that 18 isolates were positive for MBL,11 of which were IMP-9-type MBL,1 was IMP-1-type,and 6 were VIM-2-type.SIM,SPM,GIM,and NDM-1-types were not found.ERIC-PCR showed that 12 strains of IMP-producing P .aeruginosa has multiple types,6 VIM-2-producing strains were of the same type.Conclusion IMP-9 and VIM-2 are main genotypes in P .aeruginosa in Changsha.