E. coli and related bacteria constitute about 0.1% of gut flora, and fecal–oral transmission is the major route through which pathogenic strains of the bacterium cause disease.
E. coli e as bacterias relacionadas constitúen arredor do 0,1% da flora intestinal, e a transmisión fecal-oral é a principal ruta utilizada polas cepas patóxenas que causan doenzas.