Testing rules out beef patties as the source of E. coli outbreak, McDonald’s says ABC NewsMcDonald’s Quarter Pounder burgers to return to restaurants affected by E. coli outbreak CNBCNo E. Coli Found in Samples of McDonald’s Beef Patties, Officials Say The New York TimesWhere People Got Sick: E. coli Outbreak, McDonald’s Quarter Pounders – October 22, 2024 CDCWhat food safety experts steer clear of to avoid E. coli NBC News