ABSTRACT
Objective To investigate the distribution,drug resistance characteristics and genotypes of extended-spectrum-lactamases (ESBLs)-producing strain in pathogenic gram-negative rod in infection of newborn in Guangzhou.Methods The standard was performed by the production for ESBLs by phenotypic screening and confirmatory test provided by the National Committee for Clinical Laboratory Standards in 2001.The method of polymerase chain reaction(PCR) amplification was perbonmed and DNA sequences were analyzed by ESBLs gene sequencing.Results Total of 71 un-repicated and consecutive Gram-negative bacilli were isolated from 13 hospitals in Guangzhou,and the prevalence of ESBLs-producing clinical Gram-negative isolates was 59.2%(42/71).The PCR results showed that most pathogenic bacilli which infected newborn could be separated two or more genes of ESBLs.The type of TEM,SHV,CTX-M1,CTX-M9,OXA was 35.6%, 26.7% ,10.9%,24.8%,2.0%,respectively.The result of drug resistance monitoring showed that pathogenic gram-negative bacillui which infected newborn were Escherichia coli and Klebsiella pneumonia mostly.Most parts of them were drug fast and even multidrug resistant to the commonly used antibiotics.The sensitive drugs were lmipenem(the rate of sensitivty 100%),cefoperazone/sulbactam(87.3%),piperacillin/tazbatam(85.3%),ceftazidime(82%),aztreonam(82%),cefepime(81.8%).Conclusions In Guangzhou,the incidence rate of ESBLs-producing strain are very high inpathogenic bacilli which infected in newborn and is multidrug resistance.The genetypes of produced ESBLs are TEM,SHV,CTX-M1,CTX-M9,OXA.