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Quinolone-resistant clinical strains of Pseudomonas aeruginosa isolated from University Hospital in Tunisia

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Abstract

In this study, we examined mutations in the quinolone resistance-determining regions (QRDRs) of the gyrA and parC genes of Pseudomonas aeruginosa (P. aeruginosa) clinical isolates collected from patients hospitalized in University Hospital of Monastir, Tunisia. A total of 81 P. aeruginosa strains, obtained from clinical specimens, were included in the present study. Isolates were tested against 11 different antibiotics by a disk diffusion method. Minimum inhibitory concentrations (MICs) of ciprofloxacin were evaluated by E test method. The gyrA and parC sequences genes amplified by polymerase chain reaction (PCR) were sequenced. The highest resistance rates were found for ciprofloxacin (100%), gentamicin (96%) and ticarcillin (93%). The lower resistance rates were obtained for imipenem (74%) and ceftazidime (70%). Notably, 54% of isolates resistant to ciprofloxacin were determined to be multi-drug resistant. The investigation of mutations in the nucleotide sequences of the gyrA and parC genes showed that 77% of isolates have a single mutation in both gyrA (Thr-83 → Ile) and parC (Ser-87 → Leu). The emergence of ciprofloxacin resistance in clinical P. aeruginosa requires the establishment of appropriate antibiotherapy strategies in order to prescribe the most effective antibiotic treatment for preventing the emergence of multi-drug-resistant (MDR) P. aeruginosa strains.

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Authors and Affiliations

  1. Laboratoire des Maladies Transmissibles et substances biologiquement actives « LR99ES27», Faculté de Pharmacie de Monastir, Avenue Avicenne, 5000, Monastir, Tunisie

    Mouna Ben Nejma, Olfa Sioud & Maha Mastouri

Authors
  1. Mouna Ben Nejma
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  2. Olfa Sioud
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  3. Maha Mastouri
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Contributions

Mouna Ben Nejma proposed the idea of the project and contributed substantially in writing the manuscript. Olfa Sioud collected and identified the strains. Maha Mastouri is the director of laboratory and supervised the work.

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Correspondence to Mouna Ben Nejma.

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Ben Nejma, M., Sioud, O. & Mastouri, M. Quinolone-resistant clinical strains of Pseudomonas aeruginosa isolated from University Hospital in Tunisia. 3 Biotech 8, 1 (2018). https://doi.org/10.1007/s13205-017-1019-8

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