Profiles and genetic determinants of antimicrobial resistance in pathogens causing community-acquired urinary tract infections in reproductive-age women

Abstract

Objective. To characterize the profiles and genetic determinants of antibiotic resistance in pathogens of community-acquired urinary tract infections (UTI) in women of reproductive age in St. Petersburg (Russia).Materials and methods. The study included strains of microorganisms obtained from 145 women of reproductive age with diagnosed with a UTI. Antibiotic susceptibility was evaluated by disk diffusion method; the interpretation of the results was carried out in accordance with the EUCAST criteria. Strains of uropathogenic enterobacteria were tested by PCR for the presence of beta-lactamase genes: beta-lactamase genes encoding enzymes of the AmpC group (MOX, CMY, LAT, BIL, DHA, ACC, MIR, ACT, FOX), TEM, SHV, OXA‑1, ESBL genes of the CTX–M group, genes of carbapenemases (KPC, OXA‑48) and metal-beta-lactamases (VIM, IMP, NDM).Results. Most cases (81 %) of UTIs in women in St. Petersburg were due to enterobacteria, with Escherichia coli highly prevailing (66 %). Fosfomycin, meropenem and nitrofurantoin had the highest in vitro activity against uropathogenic Enterobacteriaceae. High rates of resistance to betalactam antibiotics were found (from 16 % to cefotaxime to 28 % to amoxicillin/clavulanic acid). The genes of TEM-beta-lactamases were found in 31 isolates (26.7 %), SHV – in 17 (14.6 %), CTX–M type – in 15 (12.9 %), DHA – in 2 (1.7 %). The other beta-lactam resistance genes (MOX, CMY, LAT, BIL, ACC, MIR, ACT, FOX, KPC group, OXA-like group, VIM, IMP, NDM) were not detected.Conclusion. Microbiological and molecular analysis of the structure of beta-lactam resistance is important for the effective of epidemiological control of antimicrobial resistance in pathogens causing urinary tract infections.