An E. coli outbreak linked to McDonald's Quarter Pounders has sickened nearly 50 people across 10 states, including one person who died of the infection.
Health officials have launched an investigation to determine which ingredient in the hamburgers was likely contaminated. In the meantime, McDonald's has stopped using the slivered onions and beef patties used for Quarter Pounders in the affected states. Diced onions and other types of beef patties have not been implicated in the outbreak, the Food and Drug Administration (FDA) has clarified. (Based on photos, the slivered onions appear to be short, Julienne-cut slices.)
