PCDH8 and bacterial urinary tract infection: In a further study by Santo, which was performed on VFs of pathogenic E. coli strains, the prevalence of VFs were reported as sfa 19%, aerobactin 76%, papC 11%, afa 32%, and hemolysin 96% (12).Blanco reported that the frequency rates of sfa, papC, and afa VFs in pathogenic strains of E. coli isolated from patients with UTI were 53%, 54%, and 2%, respectively (13).