ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Younes Abd El Gawwad Haggag1 , Amal Eissa Saafan1, Ahmed Osama El-Gendy1, Enas Mamdouh Hefzy2 and Sameh AbdelGhani1,3
1Department of Microbiology and Immunology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt.
2Department of Microbiology, Faculty of Medicine, Fayoum University, Fayoum, Egypt.
3Department of Pathology and Medical Laboratory, School of Medicine, Luoiiville University, KY, United States of America.
J Pure Appl Microbiol. 2020;14(2):1269-1277 | Article Number: 6018 | © The Author(s). 2020
Received: 01/01/2020 | Accepted: 03/03/2020 | Published: 19/04/2020

This study aimed to investigate the genetic basis for quinolones and fluoroquinolones insusceptibility in E.coli isolated from outpatients suspected with urinary tract infections (UTIs).  Fifty-one nalidixic acid unsusceptible E. coli isolates were collected from adult patients with UTIs . Antimicrobial sensitivity testing was performed by disc diffusion test, and minimum inhibitory concentrations of nalidixic acid and ciprofloxacin were determined by E. test strips. PCR amplification and DNA sequencing were carried out for the detection of alterations in the quinolone resistance determining region (QRDR) of gyrA and parC genes and screening for plasmid-mediated quinolone resistance (PMQR) genes (qnr, aac(6)-ib-cr, qepA and oqxAB). Genetic analysis of the QRDR revealed amino acid substitutions in the codons 83 and 87 of the gyrA gene with or without alterations at codons 80 and 84 of the parC gene. Most of the quinolone-resistant isolates (94%) had at least one of the PMQR genes. QRDR mutations in chromosomal genes encoding gyrA and parC have the principal role in the development of quinolones and fluoroquinolnes resistance in E.coli. The accumulation of amino acid alterations in gyrA and the concurrent mutations in parC lead to the emergence of a high-level of insensitivity toward fluoroquinolones. The detected PMQR determinants are widespread in the community, and they are associated with the development of resistance to many other categories of antibiotics. This is the first report to detect oqxAB in E.coli in Egypt.


E. coli, Urinary tract infection, Egypt, oqxAB

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© The Author(s) 2020. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.