Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6131361 | Clinical Microbiology and Infection | 2007 | 4 Pages |
Abstract
Plasmid-mediated quinolone resistance is being reported increasingly worldwide among isolates of enterobacteria. This resistance is mostly associated with Qnr-like determinants that confer resistance to quinolones, e.g., nalidixic acid, and reduced susceptibility to fluoroquinolones. This study investigated whether amino-acid substitutions in QnrA1 and QnrS1 determinants might be responsible for an enhancement of resistance to quinolones and, particularly, to fluoroquinolones. However, random and site-directed mutagenesis failed to identify any single amino-acid substitution that could be responsible for higher levels of resistance to quinolones or fluoroquinolones, indicating that the selection of such mutants in vivo is probably a rare event.
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Authors
V. Cattoir, L. Poirel, P. Nordmann,