A quarter pounder with cheese, fries, and a drink arranged at a McDonald’s restaurant in El Sobrante, California, US, on Wednesday, Oct. 23, 2024.
David Paul Morris | Bloomberg | Getty Images
A deadly E. coli outbreak linked to McDonald‘s Quarter Pounders has led to 75 cases in 13 states, the Centers for Disease Control and Prevention said on Friday, as it investigates the source of the spread.
The outbreak has led to 22 hospitalizations and one previously reported death of an older adult in Colorado.
Out of 61 patients with information available, 22 have been hospitalized and two people have developed a serious condition that can cause kidney failure, called hemolytic uremic syndrome. All of the 42 people who were interviewed by the CDC reported eating at McDonald’s, while 39 people reported eating a beef hamburger, the agency said.
Those with infections ranged from ages 13 to 88, according to the CDC. The agency reiterated that the number of cases in the outbreak is likely much higher than what has been reported so far. The CDC added that the outbreak may not be limited to the states with related cases. That is because many patients don’t test for E. coli and recover from an infection without receiving medical care, the CDC said. It also usually takes three to four weeks to determine if a sick person is part of an outbreak.
The CDC gave the new tally of people affected three days after the agency announced the outbreak on Tuesday, citing 49 cases and one death across 10 states. Shares of the restaurant chain are down 6% since Tuesday.
Quarter Pounder hamburgers are a core menu item for McDonald’s, raking in billions of dollars annually.
Health officials are closely examining the slivered onions used in the Quarter Pounder as a likely contaminant. McDonald’s has instructed restaurants in the affected area to remove slivered onions from their supply, and has paused the distribution of that ingredient in the region.
McDonald’s stores in Colorado, Kansas, Utah, Wyoming as well as parts of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico and Oklahoma have temporarily stopped using Quarter Pounder slivered onions and beef patties, according to the CDC.
McDonald’s identified California-based produce giant Taylor Farms as the supplier for the sliced onions the company removed from its supply chain. Taylor Farms has issued a recall on four raw onion products due to potential E. coli contamination.
But federal agencies are also investigating the Quarter Pounder’s beef patty as a potential culprit.
As the CDC and other federal agencies trace cases and work to contain the outbreak, McDonald’s has pulled Quarter Pounders from restaurants in the affected areas. Around a fifth of McDonald’s U.S. restaurants are not selling Quarter Pounder burgers.