摘要
目的了解临床分离的肺炎克雷伯菌(KPN)产超广谱β-内酰胺酶(ESBLs)及β-内酰胺酶(BLA)基因型存在状况。方法在2005年9月-2006年4月从住院患者中分离25株KPN,采用美国CLSI推荐的表型确证试验方法检测ESBLs,用PCR及序列分析的方法分析21种(群、簇)BLA基因blaTEM、blaSHV、blaLEN、blaOKP、blaCTX-M-1群、blaCTX-M-2群、blaCTX-M-9群、blaOXA-1群、blaOXA-2群、blaOXA-10群、blaCARB、blaPER、blaVEB、blaGES、blaLAP、blaDHA、blaACT/MIR、blaCMY/MOX、blaFOX、blaCMY/LAT、blaACC。结果25株KPN中,ESBLs阳性14株(56.0%)、阴性5株(20.0%)、"不确定"6株(24.0%);blaTEM、blaSHV、blaCTX-M-1群、blaOXA-10群、blaLAP和blaDHA基因阳性株数(%)分别为20株(80.0%)、1株(4.0%)、1株(4.0%)、20株(80.0%)、1株(4.0%)、8株(32.0%),而其余15种(群、簇)基因均阴性;21种(群、簇)BLA基因总阳性率为92.0%;其中HZ12593号菌株blaLAP-2基因序列已登录GenBank,注册号为EU529981。结论临床分离的KPN产ESBLs比例较高,至少存在6种BLA基因,BLA基因型以blaTEM和blaOXA-10群为主,KPN携带blaDHA基因可以影响ESBLs表型确证试验结果。
OBJECTIVE To investigate the produce of extended-spectrum β-lactamases（ESBLs） and the presence of genotype of the β-lactamases-encoding genes in Klebsiella pneumoniae isolated from the 98th Hospital of PLA,Huzhou,Zhejiang Province,China.METHODS Twenty-five strains of K.pneumoniae were isolated from the inpatients between Sep 2005 and Apr 2006.ESBLs were tested by phenotypic confirmatory tests recommended by CLSI.Twenty-one kinds of β-lactamases genes of blaTEM,blaSHV,blaLEN,blaOKP,blaCTX-M-1 group,blaCTX-M-2 group,blaCTX-M-9 group,blaOXA-1 group,blaOXA-2 group,blaOXA-10 group,blCARB,blaPER,blaVEB,blaGES,blaLAP,blaDHA,blaACT/MIR,blaCMY/MOX,blaFOX,blaCMY/LAT,and blaACC were analyzed by PCR and verified by DNA sequencing.RESULTS In 25 strains of K.pneumoniae,the positive,negative,and ＂uncertainty＂ rates of ESBLs were 56.0%,20.0%,and 24.0%,respectively.The positive rate of genes of blaTEM,blaSHV,blaCTX-M-1 group,blaOXA-10 group,blaLAP,and blaDHA were 80.0%,4.0%,4.0%,80.0%,4.0% and 32.0%,respectively.The 15 kinds of rest genes were all tested negative.The total positive rate of 21 kinds of β-lactamases gene was 92.0%.Among them,the blaLAP-2 gene sequence of the HZ12593 strain has been registered in GenBank（GenBank Accession Number： EU529981）.CONCLUSIONS There are higher rate of ESBLs-producing strains in K.pneumoniae isolated from the inpatients,and at least 6 kinds of β-lactamases gene existed.Both genes of blaTEM and blaOXA-10 group are the most common genotypes.Carring blaDHA Gene may influence the result of phenotypic confirmatory test for ESBLs in K.pneumoniae.
出处
《中华医院感染学杂志》
CAS
CSCD
北大核心
2009年第24期3305-3309,共5页
Chinese Journal of Nosocomiology
关键词
肺炎克雷伯菌
超广谱Β-内酰胺酶
基因
Klebsiella pneumoniae
Extended-spectrum β-lactamases（ESBLs）
Genes
