In this study, the most commonly transcribed genes were fimH (89.5%) and papC (29%) (cellular adhesion); irp2 (58.5%) and iroN (32.5%) (iron acquisition systems), kpsMTII (72.5%) (protectins); and cnf1 (33.5%) (toxins) (Table 6), which were mainly observed in CVEC strains isolated from chronic and occasional infections. This evidence concerns the gene PCDH8 and infection.