【摘要】 目的探讨肺炎克雷伯菌耐药性及产ESBLs与AmpC酶的存在形式、基因类型和转移方式。方法采用K-B法和微量稀释法测定病原菌对17种抗菌药物的药敏率,用PCR法及基因测序分析两种酶基因的类型,采用接合转移试验了解肺炎克雷伯菌耐药基因转移方式。结果对头孢西丁耐药的55株肺炎克雷伯菌中单产ESBLs为主要形式,ESBLs基因绝大多数为CTX-M型,AmpC酶基因绝大多数为MIR和DHA型,它们均能通过接合转移方式将其质粒携带的耐药性传递至受体菌。结论同时存在的产ESBLs与AmpC酶是肺炎克雷伯菌耐药的主要原因,产酶株对多种抗菌药物耐药,耐药基因的转移可导致耐药性的传播扩散。更多还原

【Abstract】 OBJECTIVE To explore the drug-resistance,the existing forms,genotype,and transfer ways of extended spectrum β-lactamases(ESBLs) and plasmid AmpC enzyme in Klebsiella pneumoniae.METHODS The drug sensitivity of K.pneumoniae to 17 antibiotics was done by slip-diffusion and microdilution methods.The genotype of two enzymes was assessed by PCR and sequencing.The transfer ways of K.pneumoniae drug-resistant gene were identified by transconjugants-test.RESULTS The ESBLs were mainly produced in 55 cefoxitin resistant K.pneumonia strains.The major genotypes of ESBLs and plasmid AmpC nzyme were CTX-M,MIR and DHA.These genes could be transferred from clinical isolates to recipient bacteria.CONCLUSIONS ESBLs as well as AmpC enzymes are the most important resistance mechanism in K.pneumoniae.The resistance could be transferred through the bacterial conjugation.更多还原