McDonald's will resume Quarter Pounder sales, excluding slivered onions, following revelations that beef patties aren't the source of an E. coli outbreak linked to Taylor Farms' onions. The outbreak has affected 75 individuals in 13 states with one fatality. The FDA and CDC continue to investigate the source of the contamination, which is believed to involve uncooked slivered onions. Taylor Farms has recalled yellow onions, and affected McDonald's restaurants will reintroduce the Quarter Pounder as the investigation unfolds.