Open AccessDistribution of ciprofloxacin-resistance genes among ST131 and non-ST131 clones of Escherichia coli isolates with ESBL phenotypes isolated from women with urinary tract infection
Author(s) -
Masoumeh Rasoulinasab,
Fereshteh Shahcheraghi,
Mohammad Mehdi Feizabadi,
Bahram Nikmanesh,
Azade Hajihasani,
Mohammad Mehdi Aslani
Publication year - 2021
Publication title -
iranian journal of microbiology.
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 27
eISSN - 2008-4447
pISSN - 2008-3289
DOI - 10.18502/ijm.v13i3.6389
Subject(s) - ciprofloxacin , escherichia coli , phenotype , microbiology and biotechnology , biology , urinary system , gene , antibiotic resistance , drug resistance , antibiotics , genetics , endocrinology
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 nonST131 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.