Preliminary data implicates slivered onions used on Quarter Pounders as a possible source, and recent testing rules out beef ...

The U.S. Food and Drug Administration continues to believe that slivered onions from a single supplier are the likely source ...

McDonalds confirms beef patties not to blame for E. coli outbreak linked to Quarter Pounders, and raw onions are the likely ...

No E. coli was detected in samples of beef patties used in McDonald's Quarter Pounders that have been linked to a deadly ...