The investigation into the E. coli outbreak linked to McDonald's Quarter Pounder hamburgers has concluded, with health officials determining raw onions were the likely source.
Of the 104 individuals who fell ill, approximately 84 percent reported consuming menu items that included slivered onions, informing investigators about the cause.
Despite limited evidence, the FDA concluded that contaminated yellow onions were the likely source of the outbreak after analyzing interviews with sick individuals.
McDonald's confirmed it will no longer use Taylor Farms onions from its Colorado Springs facility as a precautionary measure following the E. coli outbreak.
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