McDonald's announced the return of Quarter Pounders at hundreds of locations after determining that beef patties were not responsible for the E. coli outbreak.
The FDA indicated that slivered onions from a supplier are the likely source of contamination, leading to a nationwide outbreak affecting 75 individuals across 13 states.
McDonald's confirmed that contaminated slivered onions from Taylor Farms, used in affected burgers, came from a facility in Colorado Springs, prompting a supply chain overhaul.
The outbreak, which caused one death and numerous hospitalizations, led McDonald's to pull the Quarter Pounder from its menu until the source was identified.
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