氨基糖苷类高水平耐药肠球菌的耐药及分子机制的研究
Chinese Journal of Laboratory Diagnosis(2013)
Abstract
目的 分析氨基糖苷类高水平耐药(High Level Aminoglyeoside Resistant,HLAR)肠球菌的耐药性与耐药基因,并研究其耐药分子机制.方法 采用VITEK-2全自动鉴定仪法测定53株氨基糖苷类高水平耐药肠球菌对11种抗菌药物的最小抑菌浓度,用聚合酶链反应(PCR)检测肠球菌转座子Tn917和Tnl546/Tn916、红霉素耐药基因ermB、毒力岛基因mefA、I类整合酶IntI1、氯霉素耐药基cat、表面蛋白基因esp,并对万古霉素耐药肠球菌(Vancomycin-resistant Enterococc,VRE)进行基因分型(vanA、vanB、vanC).结果 53株肠球菌检出含ermB 26株,占49.0%;含mefA 9株,占17.0%;含Tnl546/Tn916 19株,占35.8%;含Tn917 11株,占20.8%;含IntI1 26株,占49.1%;含esp 15株,占28.3%;未检出cat.53株肠球菌对复方新诺明全部耐药,对红霉素耐药高达94.3%,对高水平庆大霉素、高水平链霉素、环丙沙星、四环素和氨苄西林的耐药率分别为75.5%、73.6%、75.5%、66.0%、62.3%;对利奈唑胺和替考拉宁的敏感率高达98.1%;1株耐万古霉素,其基因和表型均为VanA.结论 HLAR肠球菌可携带多种耐药基因,耐药基因与肠球菌耐药性密切相关,可能在多重耐药机制中起重要作用.
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Key words
resistance gene,Enterococcus,molecular mechanismin
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