Extended-spectrum ?-Lactamases and Resistance in Escherichia coli Isolated from Biliary Tract and Abdominal Cavity / 中华医院感染学杂志

ABSTRACT

OBJECTIVE To investigate the prevalence of extended-spectrum ?-lactamases(ESBLs) and the resistance in Escherichia coli isolates from biliary tract and abdominal cavity.METHODS ESBLs-producers were detected by CLSI Phenotypic Confirmatory Test and susceptibilities were tested by agar dilution method.RESULTS 50.1% Of isolates were ESBLs producers in those isolates.ESBLs producers were highly resistant to ampicillin,cefazolin,cefuroxime,fluoroquinolones,and cefotaxime.The resistant rate to ceftazidime,cefepime,cefoperazone-sulbactam,amikacin,and cefmetazole was less than 40%.None was resistant to meropenem in ESBLs producers.In non-ESBLs producers the resistant rate to ampicillin,cefazolin,cefuroxime,fluoroquinolones was more than 40% and most were susceptible to other antimicrobial agents.The resistant rate to ampicillin,cefazolin,cefuroxime,and ciprofloxacin was significantly higher in ESBLs producers than non-ESBLs producers.CONCLUSIONS With resistance to most of antimicrobial agents,ESBLs-producers were highly prevalent in E.coli isolates from biliary tract and abdominal cavity,so more attention should be paid to survey and detect those strains.