Key points
Epidemiologic and traceback data show that fresh, slivered onions served at McDonald’s were the likely source of this outbreak. Affected onions served at McDonald's locations were recalled and are past shelf life.
Where sick people live
This map shows where the 104 people in this E. coli outbreak lived.
This outbreak may not be limited to the states with known illnesses, and the true number of sick people is likely much higher than the number reported. This is because many people recover without medical care and are not tested for E. coli.