NICU耐碳青霉烯肺炎克雷伯菌耐药及多位点序列分析

Drug resistance and multilocus sequence analysis of carbapenem-resistant Klebsiella pneumoniae strains in NICU

  • 摘要: 目的 分析NICU耐碳青霉烯肺炎克雷伯菌(CRKP)耐药及同源性,为临床防控CRKP提供实验依据。方法 收集2016年1-12月某教学医院NICU 首次分离的CRKP,使用PCR方法检测常见ESBLs基因(SHV、TEM、CTX-M1、CTX-M2、CTX-M8、CTX-M9)、AmpC酶基因(HAD、CMY)、碳青霉烯酶基因(KPC、NDM、SME、GES、VIM、IMP、OXA-48)和多粘菌素耐药基因MCR-1等,并采用多位点序列分析(MLST)方法分析同源性。结果 共收集44株CRKP,KPC-2基因携带率为100%,DHA-1携带率为70.5%,CTX-M基因携带率为68.2%,MLST共有4类分型,ST11型35株,ST48型6株,ST134型1株,未分型4株。结论 NICU病区分离CRKP均为多重耐药,NICU以携带KPC-2基因的ST11型菌株流行为主,应规范抗菌药物使用,加强消毒隔离措施,控制流行传播。

     

    Abstract: OBJECTIVE To observe the drug resistance and homology of carbapenem-resistant Klebsiella pneumoniae (CRKP) strains isolated from NICU so as to provide experimental basis for clinical prevention and control of CRKP strains. METHODS The CRKP strains that were initially isolated from NICU of a teaching hospital from Jan 2016 to Dec 2016 were collected.The common ESBLs genes (SHV, TEM, CTX-M1, CTX-M2, CTX-M8, CTX-M9), AmpC enzyme genes (HAD,CMY), carbapenemase genes (KPC, NDM, SME, GES, VIM, IMP, OXA-48) and polymyxin resistance genes such as MCR-1 were detected by using PCR, and the homology was analyzed by means of multilocus sequence analysis. RESULTS Of totally 44 strains of CRKP, 100% carried with KPC-2 gene, 70.5% carried with DHA-1 gene, 68.2% carried with CTX-M gene.The MLST showed that the strains were classified into totally 4 types and there were 35 strains of ST11, 6 strains of ST48, 1 strain of ST134 and 4 untyped strains. CONCLUSION All of the CRKP strains that are isolated from the NICU ward are multidrug-resistant, the type ST11 strains that carry with KPC-2 gene are prevalent in the NICU.It is necessary to reasonably use antibiotics and strengthen disinfection and isolation measures so as to control the prevalence and spread.

     

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