LOS ANGELES -- Testing has ruled out beef patties as the source of the outbreak of E. coli poisoning tied to McDonald’s ...

Beef patties used in McDonald's Quarter Pounders have tested negative for the strain of E. coli linked to a deadly outbreak ...

McDonald’s announced on Sunday that its beef patties are not responsible for the E. Coli outbreak linked to the company’s ...

McDonald's says tests have ruled out beef patties as the source of the E. coli outbreak tied to Quarter Pounders.