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Why Fast-Food Chains Pulled Onions After McDonald’s 2024 E. coli Outbreak

Several chains temporarily removed onions from selected restaurants in October 2024 after an E. coli outbreak linked to McDonald’s slivered onions. The moves were precautionary, not evidence of cases at those chains.
From TheFinanceBase Team3 min to read
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In October 2024, several fast-food chains temporarily removed some onions as a precaution after an E. coli outbreak linked to McDonald’s Quarter Pounders. The actions were limited: Yum Brands pulled fresh onions from select Taco Bell, KFC and Pizza Hut restaurants, while Burger King directed a small subset of its restaurants to discard onions from a relevant distribution facility. Those steps did not mean the other chains had confirmed outbreaks.

Which chains pulled onions, and how broad were the actions?

The public reports described temporary, precautionary measures at selected restaurants—not a nationwide removal by every chain. Companies did not disclose a complete list of affected locations or all supplier details.

Chain or company Onions and action reported Scope disclosed
Taco Bell, KFC and Pizza Hut (Yum Brands) Yum removed fresh onions from select restaurants while monitoring the outbreak. The October 24, 2024, Axios report did not state how many restaurants or identify their locations. Axios and The Washington Post described the move as limited or precautionary.
Burger King The company said it asked restaurants to discard whole onions distributed by the relevant facility and restocked from other facilities. Burger King told Axios that the direction applied to 5% of its restaurants that received those onions. It said it had not been contacted by health authorities and had no indications of illness. Axios
McDonald’s Temporarily stopped using slivered onions in affected restaurants. The pause covered Colorado, Kansas and Wyoming and portions of Iowa, Idaho, Missouri, Montana, Nebraska, New Mexico, Nevada, Oklahoma and Utah—not all U.S. restaurants. McDonald’s later reintroduced slivered onions from a different supplier at stores where use had paused. FDA

What caused McDonald’s onion response?

FDA’s final investigation concluded that recalled yellow onions served as slivered onions on McDonald’s Quarter Pounders were the likely outbreak source, based on epidemiologic and traceback evidence. Taylor Farms initiated a voluntary recall of yellow onions sent to McDonald’s and other food-service customers on October 22, 2024. FDA said it contacted affected food-service customers directly and that the recalled onions were unlikely to have been sold in grocery stores or directly to consumers. FDA’s final update

The distinction between the evidence and a laboratory confirmation matters. FDA said the E. coli strain linked to illnesses was not found in onion or environmental samples. Some samples tested positive for a different type of Shiga toxin-producing E. coli (STEC), which did not match the outbreak strain or other clinical illnesses. The likely-source conclusion came from epidemiologic and traceback evidence, not a positive onion sample containing the outbreak strain. FDA; CDC

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How the outbreak response unfolded

  • October 22, 2024: FDA’s initial notice said the ingredient had not yet been confirmed, although preliminary traceback and distribution information pointed to slivered onions. McDonald’s paused use of that type of onion in affected states, and Taylor Farms initiated its voluntary recall. FDA said McDonald’s diced onions were not implicated. FDA
  • October 24, 2024: Reports described the selected Yum Brands and Burger King restaurant actions as public-health agencies continued investigating. Axios
  • December 3, 2024: FDA’s final update recorded 104 reported illnesses in 14 states, 34 hospitalizations and one death. CDC considered the outbreak over and FDA closed its investigation. The last reported illness onset was October 21, 2024. FDA

FDA’s interviews added context, but they are not estimates of an individual customer’s chance of becoming ill: 80 of 81 interviewed people who had eaten at McDonald’s reported eating there in the week before illness; among 75 people who recalled menu items, 63 reported eating an item containing fresh slivered onions. FDA

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What consumers needed to know

The recall was directed at food-service customers that received the affected onions, not at consumers generally. FDA told those businesses not to sell or serve recalled product and to clean and sanitize surfaces and containers that may have contacted it. CDC’s final update said people did not need to avoid onions or foods made with onions generally because the onions had been recalled. FDA; CDC

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The reports document what restaurants said during the 2024 response; they do not establish current menu offerings or present-day supplier arrangements.

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