E.coli O157 is a form of food poisoning caused by a particularly strong type of Escherichia coli bacteria which typically results in diarrhoea.
E.coli O157 is usually spread by:
The illness can occur within 3–8 days of infection, but in most cases it’s 3–4 days.
Symptoms normally persist for about a week. In young children, the elderly or people who are already unwell, E.coli O157 may be worse and there is a risk of complications such as kidney failure, so in these cases you should always see a doctor.