At least 75 people fell ill from the bacterial infection and one person died in Colorado from the O157:H7 strain of E. coli, the Centers for Disease Control and Prevention said Friday. McDonald’s attributed the illnesses to slivered onions, and the Food and Drug Administration indicated that onions might have been the source of the outbreak.

An E. coli outbreak linked to McDonald's Quarter Pounders sold at locations across the United States has sickened at least 49 people, landed 10 in the hospital and caused one death. Cases have been reported in 10 states so far,