What is a common symptom associated with infections caused by pathogenic E. coli strains?

Infections caused by pathogenic strains of E. coli, particularly Enterohemorrhagic E. coli (EHEC), are known to result in symptoms like bloody diarrhea. This occurs due to the release of toxins, specifically Shiga toxin, that damage the lining of the intestines, leading to ulceration and bleeding. The presence of blood in the stool is a hallmark indicator of this type of infection and is a crucial symptom that differentiates it from other gastrointestinal infections. While fever, nausea, and headache can be associated with a variety of infections, bloody diarrhea is specifically tied to the pathogenic effects of certain E. coli strains, highlighting its significance as a distinguishing symptom in the context of such infections.