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• W3206386183 abstract "Introduction. The resistance to quinolone reported in uropathogenic Escherichia coli (UPEC) is commonly caused by mutations in the target site encoding genes such as the gyrA gene. Bacterial plasmids carrying resistance genes such as qnr genes can also transfer resistance. Biofilms produced by UPEC can further aid the development of resistant urinary tract infections (UTIs).Hypothesis. Biofilm production is associated with higher prevalence of quinolones resistance genetic determinants.Aim. To detect the prevalence of qnr genes and gyrA gene mutation among quinolone-resistant UPEC and to investigate the relation between these genetic resistance determinants and biofilm production.Methodology. Catheterized urine samples were collected from 420 patients with evidence of UTIs and processed using standard techniques. Isolated UPEC were screened for quinolone resistance using an antimicrobial susceptibility test. Biofilm production among quinolone-resistant isolates was detected using the tissue culture plate method. All quinolone-resistant isolates were screened for qnr genes (qnrA, qnrB and qnrS) by multiplex PCR and for gyrA gene mutation by PCR-RFLP.Results. Two hundred and sixty-four UPEC isolates were detected from 420 processed urine samples. Out of the identified 264 UPEC, 123 (46.6 %) isolates were found to be quinolone-resistant, showing resistance to 1 or more of the tested quinolones. Of the 123 quinolone-resistant UPEC detected, 71(57.7 %) were biofilm producers. The qnr genes were detected among 62.6 % of the quinolone-resistant UPEC, with an estimated prevalence of 22.8, 32.5 and 37.4 % for qnrA, qnrB and qnrS genes, respectively. Additionally, the gyrA gene mutation was identified among 53.7 % of the quinolone-resistant isolates. We reported a significant association between biofilm production and the presence of qnrA, qnrB and qnrS genes. Furthermore, the gyrA gene mutation was significantly associated with biofilm-producing isolates. The coexistence of qnr genes, gyrA gene mutation and biofilm production was demonstrated in almost 40 % of the quinolone-resistant isolates.Conclusions. A significantly higher prevalence of qnr genes (qnrA, qnrB and qnrS) as well as the gyrA gene mutation was found among biofilm-forming UPEC. The reported coexistence of these different resistance mechanisms could aggravate quinolone resistance. Therefore, monitoring of resistance mechanisms and a proper stewardship programme are necessary." @default.
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• W3206386183 date "2021-10-19" @default.
• W3206386183 modified "2023-10-14" @default.
• W3206386183 title "Quinolone-resistant uropathogenic E. coli: is there a relation between qnr genes, gyrA gene target site mutation and biofilm formation?" @default.
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• W3206386183 doi "https://doi.org/10.1099/jmm.0.001432" @default.
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