AIM:To investigate the mechanism of carbapenems resistance in Acinetobacter baumannii in nanchang.METHODS:Nonduplicate carbapenem- resistant A. baumannii(CRAB)isolates collected during 2012 in Second Affiliated Hospital of Nanchang University,strains were identified by vitek-32 automatic microbe analyzer,antimicrobial susceptibility testing by Kirby-Bauer method,AmpC enzyme by three dimensional test,Metalloβ-lactamases(MBLs)by EDTA synergy test.Resistance genes were amplified by PCR,the positive results wer...