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The relative contribution of efflux and target gene mutations to fluoroquinolone resistance in recent clinical isolates of Pseudomonas aeruginosa

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Abstract

The clinical utility of fluoroquinolones (FQs) for the treatment of Pseudomonas aeruginosa (PA) and other serious Gram-negative infections is currently decreasing due to the rapid emergence of resistance. Because previous studies have shown that efflux is a common mechanism contributing to FQ resistance in PA, one suggested approach to extend the longevity of this class of drugs is combination therapy with an efflux pump inhibitor (EPI). In order to determine the viability of this approach, it is necessary to understand the relative contribution of efflux- vs. target-mediated mechanisms of FQ resistance in the clinic. A set of 26 recent PA clinical isolates were characterized for antibiotic resistance profiles, efflux pump expression, topoisomerase mutations, and FQ susceptibility with and without an EPI. The contribution of OprM to the overall antibiotic resistance was assessed in a subset of these strains. Our results suggest that the co-administration of an EPI with FQs or other antibiotics currently in use would not be sufficient to combat the complexity of resistance mechanisms now present in many clinical isolates.

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Acknowledgments

We wish to acknowledge Amy Tait-Kamradt for her help with the genomic sequencing and Andrew Tomaras and John Quinn for their critical reading of the manuscript. These studies were conducted at and funded by Pfizer Global Research and Development.

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  1. Pfizer Animal Health, 301 Henrietta St., Kalamazoo, MI, 49007, USA

    S. A. Dunham

  2. Antibacterials Biology, Pfizer Global Research and Development, Eastern Point Rd., Groton, CT, 06340, USA

    C. J. McPherson & A. A. Miller

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  1. S. A. Dunham
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Dunham, S.A., McPherson, C.J. & Miller, A.A. The relative contribution of efflux and target gene mutations to fluoroquinolone resistance in recent clinical isolates of Pseudomonas aeruginosa . Eur J Clin Microbiol Infect Dis 29, 279–288 (2010). https://doi.org/10.1007/s10096-009-0852-z

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