OBJECTIVE To investigate the resistance genes in HZB9055 strain of Enterobacter cloacae isolated from the PLA 98th Hospital,Huzhou District,Zhejiang Province,China.METHODS HZB9055 Strain of E.cloacae was isolated from the inpatient in May,2004,41 kinds(or groups) of genes were analyzed by PCR and verified by DNA sequencing.RESULTS In HZB9055 strain of E.cloacae,3 kinds of genes were positive including blaLAP,blaMIR and qnrS.The 38 kinds of rest genes were all tested negative.The blaLAP gene sequence including 858 nucleotides,which had the amino acid mutation in position 193 compared with LAP-1 type narrow-spectrum ?-lactamase(GenBank accession number:EF026092),and was nominated LAP-2(GenBank accession number:EU159120).CONCLUSIONS At least 3 kinds of resistance genes exist in HZB9055 strain of E.cloacae,and blaLAP-2 is a novel subtype of ?-lactamases gene.

OBJECTIVE To investigate the produce of extended-spectrum ?-lactamases(ESBLs) and the presence of genotype of the ?-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 ?-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 ?-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 ?-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.