Increased virulence potential is characterized by E. coli strains equipped with many genes coding for virulence factors, which primarily condition resistance to bactericidal action of serum (iss) and produce adhesins (fimH, papC) and bacterial toxins (vat, pic), which, as our research results show, were detected not only in strains isolated from patients with UTI symptoms, but also in others. The gene discussed is SLC25A3; the disease is bacterial urinary tract infection.