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

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

Colorado regulators said that fresh and frozen beef tested did not include the pathogen, giving McDonald’s confidence to ...

The Colorado Department of Agriculture's testing did not detect E. coli in samples of the beef patties taken from McDonald's ...