检验医学 ›› 2016, Vol. 31 ›› Issue (1): 56-60.DOI: 10.3969/j.issn.1673-8640.2016.01.013

• 基础研究·论著 • 上一篇    下一篇

耐碳青霉烯类抗菌药物大肠埃希菌耐药机制的研究

闫文娟1, 李轶1, 王山梅1, 孙明洁2   

  1. 1.河南省人民医院检验科,河南 郑州 450003
    2.河南省人民医院医院感染管理科,河南 郑州 450003
  • 收稿日期:2014-12-30 出版日期:2016-01-31 发布日期:2016-02-16
  • 作者简介:null

    作者简介:闫文娟,女,1985年生,博士,主管技师,主要从事细菌耐药机制研究。

    通讯作者:孙明洁,联系电话:0371-65580697。

  • 基金资助:
    河南省科技厅资助项目(No.132300410038)

Research on the drug resistance mechanism of carbapenem-resistant Escherichia coli

YAN Wenjuan1, LI Yi1, WANG Shanmei1, SUN Mingjie2   

  1. 1.Department of Clinical Laboratory,Henan Provincial People's Hospital,Zhengzhou 450003,Henan,China
    2.Department of Nosocomial Infection,Henan Provincial People's Hospital,Zhengzhou 450003,Henan,China
  • Received:2014-12-30 Online:2016-01-31 Published:2016-02-16

摘要: 目的了解河南省人民医院耐碳青霉烯类抗菌药物大肠埃希菌的耐药特点和耐药机制。方法收集临床送检合格样本分离到的细菌,采用BD Phoenix 100微生物分析系统进行细菌鉴定及体外药物敏感性分析,依照美国临床实验室标准化协会(CLSI)标准筛选出耐碳青霉烯类大肠埃希菌。采用改良Hodges和美罗培南(MEM)-乙二胺四乙酸(EDTA)-Na2双纸片协同试验进行表型筛选。聚合酶链反应(PCR)检测耐药基因blaKPCblaNDMblaVIMblaIMPblaOXA-48。对blaKPC阳性菌株进行接合转移试验。结果从1 238株大肠埃希菌中筛选到8株耐碳青霉烯类菌株,7株对亚胺培南(IPM)、MEM均耐药,有1株仅对MEM耐药。8株改良Hodges试验均为阳性,6株双纸片协同试验阳性。2株携带blaKPC-2,3株携带blaIMP-4blaKPC-2可以发生接合转移。结论首次在河南省人民医院发现产blaIMP-4的大肠埃希菌,其耐碳青霉烯类抗菌药物的机制主要为携带blaKPC-2blaIMP-4,blaKPC-2基因可以通过质粒水平传播。

关键词: 大肠埃希菌, 碳青霉烯酶, 耐药机制

Abstract:

Objective To investigate the drug resistance characteristics and mechanism of carbapenem-resistant Escherichia coli in Henan Provincial People's Hospital. Methods The identification and antimicrobial susceptibility in vitro of the isolates from qualified clinical specimens were analyzed by BD Phoenix 100 microorganism analysis system. The isolates of carbapenem-resistant Escherichia coli were screened according to the Clinical and Laboratory Standards Institute (CLSI) standard. Modified Hodges test and meropenem(MEM)-ethylene diamine tetraacetic acid (EDTA)-Na2 double-disk synergy test were used for phenotypic screening of the isolates. By polymerase chain reaction(PCR),the resistance genes,blaKPC,blaNDM,blaVIM,blaIMP and blaOXA-48,in the isolates were detected. The transferability of blaKPC in the blaKPC-positive isolates was studied by conjugation test. Results A total of 8 carbapenem-resistant Escherichia coli were screened from the 1 238 isolates. In the 8 isolates,7 isolates were resistant to imipenem (IPM)and MEM,but 1 isolate was only resistant to MEM. All the 8 isolates were positive in the modified Hodges test, and 6 isolates were positive in the MEM-EDTA double-disk synergy test. There were 2 isolates carrying blaKPC-2 and 3 isolates carrying blaIMP-4. Conjugation test indicated that blaKPC-2 could be transferred to Escherichia coli. Conclusions Carbapenem-resistant Escherichia coli carrying blaIMP-4 is firstly reported in the hospital. The resistance mechanism of carbapenem-resistant Escherichia coli in the hospital is mainly carrying blaKPC-2 and blaIMP-4,and the blaKPC-2 gene could be horizontally transmitted by plasmid.

Key words: Escherichia coli, Carbapenem, Drug resistance mechanism

中图分类号: