Prevalence of qnr and aac(6’)-Ib-cr Genes in Clinical Isolates of Klebsiella Pneumoniae from Imam Hussein Hospital in Tehran


Background: Plasmid mediated quinolone resistance (PMQR) has been shown to play an important role in resistance not only to quinolones, but also β-lactams and aminoglycosides. In fact, qnr genes are frequently carried along with β-lactamase determinants on the same plasmids. We studied the prevalence of qnrA, qnrB, qnrS and aac(6’)-Ib-cr genes among quinolone and cephalosporin resistant clinical isolates of Klebsiella pneumoniae (K. pneumoniae), as well as the association between PMQR genes with resistance to quinolones, cephalosporins and aminoglycosides. Methods: The study was conducted on 79 K. pneumoniae clinical isolates collected from Imam Hussein hospital in Tehran between July 2010 and January 2011, based on their resistance to quinilones and cephalosporins. Antibacterial susceptibilit

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