No E. coli was detected in samples of beef patties used in McDonald's Quarter Pounders that have been linked to a deadly outbreak, a company spokesperson said Sunday, citing tests done by the Colorado Department of Agriculture. At this time, the department has no further plans to test the beef patties, the company spokesperson said, and the patties have been ruled out as the source of the outbreak.
coli outbreak linked to McDonald's Quarter Pounders in multiple states, prompting the fast-food chain to stop using slivered onions and quarter-pound beef patties in several states, the agency said at the time. The CDC said Tuesday that the first E. coli case linked to McDonald's occurred Sept. 27. State health officials in Colorado then notified the CDC of an unusual uptick in the illness on Oct. 10 and the agency started investigating Oct.