多药耐药肺炎克雷伯菌喹诺酮类耐药相关基因研究

Quinolone-resistance Genes in Multi-Drug-Resistant Klebsiella pneumoniae

目的了解多药耐药肺炎克雷伯菌(MDRKP)喹诺酮类耐药机制。方法对一组25株MDRKP进行了染色体介导和质粒介导的耐药相关基因进行检测和分析。结果25株中,有19种存在gyrA基因突变(76.0%);9株存在aac(6′)-Ⅰb-Cr(36.0%);2株存在qnrA1基因(8.0%)、2株存在qnrB基因(qnrB4-like)(8.0%)、3株存在qnrS1基因(12.0%);25株均存在mdf A基因,未检出qepA基因。结论在MDRKP中,gyrA基因突变是喹诺酮类耐药的主要原因。

OBJECTIVE To investigate the quinolone-resistance mechanisms of multi-drug-resistant Klebsiella pneumoniae（MDRKP）.METHODS Seven kinds of chromosome and plasmid mediated quinolone-resistance genes were analyzed by PCR and verified by DNA sequencing in 25 strains of MDRKP.RESULTS In 25 strains of MDRKP,the positive rate of genes of gyrA,aac（6′）-Ⅰb-Cr,qnrA1,qnrB4-like,qnrS1,mdfA,and qepA were 76.0%,36.0%,8.0%,8.0%,12.0%,100.0%,and 0,respectively.CONCLUSIONS The mutation of gyrA gene is the main cause of the resistance of quinolone in the 25 strains of MDRKP.