产AmpC酶肺炎克雷伯菌对氨基糖苷类抗菌药物耐药机制研究
发布时间:2018-10-30 13:23
【摘要】:目的了解产AmpC酶肺炎克雷伯菌对氨基糖苷类耐药基因、AmpC型β-内酰胺酶基因,整合子遗传标记的存在状况以及菌株的亲缘关系。方法收集医院住院患者痰液标本中分离的肺炎克雷伯菌20株,头孢西丁三维试验均为阳性,采用聚合酶链反应(PCR)法分析7种氨基糖苷类修饰酶、6种16SrRNA甲基化酶、6种AmpC型β-内酰胺酶基因和3种整合子遗传标记,并对检测结果作样本聚类分析。结果 20株产AmpC酶肺炎克雷伯菌均检出氨基糖苷类耐药基因和blaDHA、intⅠ1基因,氨基糖苷类修饰酶基因检出aac(3)-Ⅱ18株、aac(6')-Ⅰb 10株、ant(3″)-Ⅰ5株,检出阳性率分别为90.0%、50.0%、25.0%,16SrRNA甲基化酶检出rmtB2株,检出阳性率为85.0%;样本聚类分析提示,该组菌可分为两个簇群,A簇群中又可分为A1、A2两个亚簇群,A1亚簇群中可分为A1.1(1、5、7、8、10、12、16、20号株)和A1.2(6、15)两个子簇群,均为克隆传播;A2亚簇群中可分为A2.1(2、3、4号株)和A2.2(9、11、13、18、19号株)两个子簇群,亦均为克隆传播,B簇群(14、17号株)亦为克隆传播。结论肺炎克雷伯菌耐药表型与基因型结果相符,携带blaDHA基因导致对AmpC型β-内酰胺类药物耐药,携带aac(3)-Ⅱ、aac(6′)-Ⅰb、ant(3″)-Ⅰ、rmtB基因导致对氨基糖苷类药物耐药,Ⅰ类整合子可能是上述基因的载体,本组菌株存在医院感染的可能。
[Abstract]:Objective to investigate the presence of AmpC enzyme producing Klebsiella pneumoniae aminoglycoside resistant gene, AmpC type 尾 -lactamase gene, integron genetic markers and the relationship between the isolates. Methods Twenty strains of Klebsiella pneumoniae isolated from sputum samples of hospitalized patients were collected, all of which were positive for cefxitin. Seven aminoglycoside modifiers and six 16SrRNA methylases were detected by polymerase chain reaction (PCR). Six AmpC type 尾 -lactamases genes and three integron genetic markers were used for sample cluster analysis. Results Aminoglycoside resistant gene and blaDHA,int 鈪,
本文编号:2300121
[Abstract]:Objective to investigate the presence of AmpC enzyme producing Klebsiella pneumoniae aminoglycoside resistant gene, AmpC type 尾 -lactamase gene, integron genetic markers and the relationship between the isolates. Methods Twenty strains of Klebsiella pneumoniae isolated from sputum samples of hospitalized patients were collected, all of which were positive for cefxitin. Seven aminoglycoside modifiers and six 16SrRNA methylases were detected by polymerase chain reaction (PCR). Six AmpC type 尾 -lactamases genes and three integron genetic markers were used for sample cluster analysis. Results Aminoglycoside resistant gene and blaDHA,int 鈪,
本文编号:2300121
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