U.S. Centers for Disease Control and Prevention has said that slivered onions on the Quarter Pounders were the likely source of the E. coli.
McDonald's is investing $100 million to bring in customers after E. coli outbreak
→
Most of the estimated 48 million cases of food poisoning each year are not related to confirmed outbreaks, the agency said.
Experts say the food supply is safe after McDonald's and Boar's Head outbreaks
→