Abstract

Background and Objectives: Increasing emergence of fluoroquinolone resistance among clinical isolates of Klebsiella pneumoniae  (K. pneumoniae), has limited the treatment options for treatment of infections caused by these bacteria. The aim of this study was to investigate the dissemination of genes encoding AcrAB and QepA efflux pumps among K. pneumoniae strains.

Methods: This study was carried out on 117 K. pneumoniae strains isolated from patients hospitalized in selected hospitals in Tehran city, 2015-2016, Iran. Antimicrobial susceptibility tests were performed using disk diffusion method (based on CLSI guidelines) and identification of acr A, acr B and qep A genes using PCR assay.

Results: In this study, colistin and tigecycline had the best effect against clinical isolates of K. pneumoniae. According to PCR results, 110 (94%) isolates had acrA gene and 102 (87%) isolates had acrB gene, respectively. The qepA gene was not found in any of the K. pneumoniae strains.

Conclusion: According to the results of the present study, dissemination of the genes encoding AcrAB efflux pumps among K. pneumoniae strains, which cause resistance to fluoroquinolones, is a matter of concern. Therefore, infection control and prevention of the spread of drug-resistant bacteria requires careful management in drug prescription and identification of resistant isolates.