Objective To detect the expression of the acrA gene of carbapenem-resistant and NDM-1-producing Klebsiella pneumoniae in order to determine the importance of the AcrAB efflux pump in resistance to carbapenems. Methods Seven carbapenem-resistant isolates and 10carbapenem-sensitive isolates were obtained from neonates.Phenotypes of drug-resistant bacteria were tested with the K-B method and an E-test.The modified Hodge test was used to verify that isolates were carbapenemase-producing strains.The genotypes of...