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McDonald’s Suspends Onion and Beef Patties in Response to E. coli Outbreak Investigation

U.S. Centers for Disease Control and Prevention (CDC)Atlanta, GA – U.S. Centers for Disease Control and Prevention (CDC), U.S. Food and Drug Administration (FDA), U.S. Department of Agriculture (USDA) FSIS, and public health officials in multiple states are investigating an outbreak of E. coli O157:H7 infections.

Most people in this outbreak are reporting eating the Quarter Pounder hamburger at McDonald’s before becoming sick. It is not yet known which specific food ingredient is contaminated.

McDonald’s is collaborating with investigation partners to determine what food ingredient in Quarter Pounders is making people sick. McDonald’s stopped using fresh slivered onions and quarter-pound beef patties in several states while an investigation is ongoing to identify the ingredients causing the illness.

Taylor Farms, the supplier of slivered onions to the affected McDonald’s locations, has initiated a voluntary recall and has asked customers to stop using some onions while this investigation is ongoing. Food service customers were contacted directly and told to remove onions.

Contaminated food

McDonald’s Quarter Pounder hamburgers are making people sick

  • Quarter Pounder hamburgers will not be available temporarily in some states while McDonald’s makes some supply changes.
  • McDonald’s stores in Colorado, Kansas, Utah, Wyoming, and portions of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico, and Oklahoma have temporarily stopped using their current supply of Quarter Pounder slivered onions and beef patties.
  • McDonald’s is proactively making these changes while investigators work to confirm the contaminated ingredient. Quarter pound beef patties are only used on Quarter Pounders. Fresh slivered onions are primarily used on Quarter Pounder hamburgers and not other menu items.
  • Investigators are working to confirm which ingredient in these hamburgers is making people sick and if it went to other restaurants or stores.

What you should do

McDonald’s has stopped using fresh slivered onions and quarter pound beef patties in several states to protect their customers while a source of illness is confirmed.

Call your healthcare provider if you have severe E. coli symptoms:

  • Diarrhea and a fever higher than 102°F
    • Diarrhea for more than 3 days that is not improving
    • Bloody diarrhea
  • So much vomiting that you cannot keep liquids down
  • Signs of dehydration, such as:
    • Not peeing much
    • Dry mouth and throat
    • Feeling dizzy when standing up

What businesses should do

  • Food service operators should not sell, eat, or serve Taylor Farms recalled yellow onions.
  • Taylor Farms contacted businesses directly.

Symptoms of E. coli

  • Most people infected with Shiga toxin-producing E. coli experience severe stomach cramps, diarrhea (often bloody), and vomiting.
    • Symptoms usually start 3 to 4 days after swallowing the bacteria.
    • Most people recover without treatment after 5 to 7 days.
  • Some people may develop serious kidney problems (hemolytic uremic syndrome, also called HUS) and would need to be hospitalized.
  • For more information about E. coli, see the About Escherichia coli Infection page
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