McDonald’s Corp (NYSE:MCD) and food safety officials have ruled out beef as the source of an E. coli outbreak linked to the chain’s Quarter Pounders. What Happened: The Colorado Department of Agriculture, after conducting numerous tests on fresh and frozen beef patties from state McDonald’s locations, found no traces of E. coli. Despite this, the source of the outbreak is still under investigation, with onions served on the burgers being the focus. The E. coli outbreak, which was revealed by federal health officials last week, has affected 75 individuals and led to one fatality across 13 state…
