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Diagn Microbiol Infect Dis. 2011 Jun;70(2):253-9. doi: 10.1016/j.diagmicrobio.2011.01.004.

Rapid detection of qnr and qepA plasmid-mediated quinolone resistance genes using real-time PCR.

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CHU Reims, Hôpital Robert Debré, Laboratoire de Bactériologie-Virologie-Hygiène, F-51092 Reims, France.


Plasmid-mediated quinolone resistance genes in clinical strains cannot be detected by phenotypic traits but require gene detection. We developed a multiplex real-time polymerase chain reaction (PCR) assay using high-resolution melting master mix with ResoLight dye to detect qnr genes and a simplex real-time PCR assay using SYBR Green I to detect qepA genes. Using qnr-positive and qepA1-positive control strains, the ResoLight method was able to rapidly identify qnrA, qnrB, qnrS, qnrC, and qnrD genes; the SYBR Green I method identified qepA genes. Among 118 extended spectrum beta-lactamase-producing Enterobacteriaceae isolates, the 2 new assays efficiently detected and identified qnr in 9 strains, but no qepA gene. To our knowledge, this is the first study describing the detection of all 5 qnr and qepA genes using real-time PCR. The 2 tests constitute a significant step forward for screening for plasmid quinolone resistance genes in clinical strains.

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