1[1]National Committee for Clinical Laoratory Standards.Performance standards for antimicrobial susceptibility testing,ninth infor-mational supplement.NCCLS documents M100-S9.Pennsylvania:NCCLS,1999,17～99.
2[2]Tzzelepi E,Glakkoupi P,Sofianou D,et al.Detection of Extended-Spectrum β-Lactamases in clinical Isolates of Enterobacter cloace and Enterobacter aerogens. J Clin Microbiol,2000,38(2):542～546.
4[4]Jacoby GA,Han P.Detection of extended-spectrum β-Lactamases in clinical Isolates of Klebsiella pneumoniae and Escherichia coli.J Clin Microbiol,1996,34:908～911.
