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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Comparison of plasmid-mediated quinolone resistance and extended-spectrum β-lactamases in third-generation cephalosporin-resistant Enterobacteriaceae from four Irish hospitals.
Journal of Medical Microbiology 2012 January
In this study, the frequency of extended-spectrum β-lactamases (ESBL) and plasmid-mediated quinolone resistance (PMQR) mechanisms were investigated in 206 clinical isolates of third-generation cephalosporin (3GC)-resistant Enterobacteriaceae in four hospitals in the Republic of Ireland. bla(CTX-M-15) was the predominant ESBL gene. Of these 3GC resistant isolates, 54 % were also resistant to ciprofloxacin. Investigation of the PMQR mechanisms revealed that the aac(6')Ib-cr gene predominated in fluoroquinolone-resistant (FQR) strains of Escherichia coli and Klebsiella pneumoniae, while the qnrA gene predominated in the FQR strains of Enterobacter. The bla(CTX-M-15) gene was frequently identified with the aac(6')Ib-cr gene but was not always on the same plasmid. The prevalence of the bla(CTX-M-15) gene appeared to be hospital-dependent. The epidemiology of both ESBL-producing and PMQR strains within the four hospitals indicated that their prevalence is not due to the spread of these resistance genes between isolates from different hospitals.
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