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Iranian Journal of Microbiology، جلد ۱۳، شماره ۳، صفحات ۲۹۴-۳۰۲
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عنوان انگلیسی Distribution of ciprofloxacin-resistance genes among ST131 and non-ST131 clones of Escherichia coli isolates with ESBL phenotypes isolated from women with urinary tract infection
چکیده انگلیسی مقاله Background and Objectives: Escherichia coli (E. coli) sequence type 131 (ST131) is associated with extended-spectrum beta-lactamase (ESBL) production and fluoroquinolone resistance. This study aimed to investigate the prevalence of ST131, ESBL, and plasmid-mediated quinolone resistance (PMQR) genes in the ciprofloxacin-resistant (CIPR) and ESBL producers from women with UTI. Materials and Methods: The CIP-resistant ESBL producing (CIPR/ESBL+) E. coli isolates were screened for ST131-by specific PCR of mdh and gyrB. The ESBL and PMQR genes were screened by single PCR. The ST131 and non-ST131 isolates were selected to determine the mutations of gyrA and parC using PCR and sequencing, and also their genetic background by the Pasteur-MLST scheme. Results: Overall, 55% (33/60) CIPR/ESBL+ isolates were identified as ST131 (94% O25b-ST131). Resistance rate to ampicillin-sulbactam (70%), aztreonam (97%) and gentamicin (61%), the prevalence of aac(6′)-Ib-cr (66%), blaCTX-M-15 (82%), the profile of qnrS+aac(6′)-Ib-cr (30%), and the double mutation in the parC was significantly higher in ST131 than non-ST131 isolates. The coexistence of PMQR and ESBL genes was found in more than 50% of ST131 and non-ST131 isolates. ST131 isolates differentiated into PST43 and PST506. Conclusion: Management of women with UTI caused by the CIPR/ESBL+ isolates (ST131) co-harbored PMQR, ESBL, and chromosomal mutations, is important for their effective therapy.
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نویسندگان مقاله | Masoumeh Rasoulinasab
Department of Bacteriology, Pasteur Institute of Iran, Tehran, Iran


| Fereshteh Shahcheraghi
Department of Bacteriology, Pasteur Institute of Iran, Tehran, Iran


| Mohammad Mehdi Feizabadi
Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Thoracic Research Center, Imam Khomeini Hospital Complex, Tehran, Iran


| Bahram Nikmanesh
Department of Medical Laboratory Sciences, School of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran


| Azade Hajihasani
Department of Bacteriology, Pasteur Institute of Iran, Tehran, Iran


| Mohammad Mehdi Aslani
Department of Bacteriology, Pasteur Institute of Iran, Tehran, Iran
نشانی اینترنتی https://ijm.tums.ac.ir/index.php/ijm/article/view/2947
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