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E coli  isolates (108) from Mexican women, clinically diagnosed with urinary tract infection, were screened to identify virulence genes, phylogenetic groups, and antibiotic resistance. Isolates were identified by MicroScan4 system; additionally, the minimum inhibitory concentration (MIC) was assessed. The phylogenetic groups and 16 virulence genes encoding adhesins, toxins, siderophores, lipopolysaccharide (LPS), and invasins were identified by PCR. Phylogenetic groups distribution was as follows: B1 9.3%, A 30.6%, B2 55.6%, and D 4.6%. Virulence genes prevalence was  ecp  98.1%,  fimH  86.1%,  traT  77.8%,  sfa/focDE  74.1%,  papC  62%,  iutA  48.1%,  fyuA  44.4%,  focG  2.8%,  sfaS  1.9%,  hlyA  7.4%,  cnf- 1 6.5%,  cdt-B  0.9%,  cvaC  2.8%,  ibeA  2.8%, and  rfc  0.9%. Regarding antimicrobial resistance it was above 50% to ampicillin/sulbactam, ampicillin, piperacillin, trimethoprim/sulfamethoxazole, ciprofloxacin, and levofloxacin. Uropathogenic  E. coli  clustered mainly in the pathogenic phylogenetic group B2. The isolates showed a high presence of siderophores and adhesion genes and a low presence of genes encoding toxins. The high frequency of  papC  gene suggests that these isolates have the ability to colonize the kidneys. High resistance to drugs considered as first choice treatment such as trimethoprim/sulfamethoxazole and fluoroquinolones was consistently observed.

Identification of Virulence Factors Genes inEscherichia coliIsolates from Women with Urinary Tract Infection in Mexico