OBJECTIVE To study the characteristics of AmpC-enzyme and extended-spectrumβ-lactamases produced by multidrug-resistant Enterobacter cloacae in ICU so as to provide theoretical basis for reasonable clinical use of antibiotics.METHODS The three dimensional testing was performed to detect the AmpC-enzyme and ESBLs.Genes were extracted and amplified by PCR,the PCR products were sequenced and confirmed,and the homology of the tested strains was analyzed through PFGE method.RESULTS Of totally 24 strains of multi...