The most typical symptom of the disease is diarrhoea.
In mild cases, the stool may be watery, in severe cases it may be purulent and bloody, with mucous membranes visible in the stool and accompanied by abdominal pressure, fever, nausea and vomiting. If left untreated dehydration may occur, complicating toxic megacolon, sepsis, intestinal perforation and even death.