E. coli Outbreak Linked to McDonald’s Quarter Pounders

Translate to Spanish or other 102 languages!

CDC, FDA, 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. Image source CDC on X
- Advertisement -

Situation summary

CDC, FDA, 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 the investigation is ongoing to identify the ingredient causing illness.

- Advertisement -

Contaminated food

McDonald’s Quarter Pounder hamburgers are making people sick, with most illnesses in Colorado and Nebraska.

  • Quarter Pounder hamburgers will not be available temporarily in some states.
  • Investigators are working to confirm which ingredient in these hamburgers is making people sick and if it went to other restaurants or stores.
  • McDonald’s reported to CDC that it has stopped using fresh slivered onions and quarter pound beef patties in several states. 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.

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.

- Advertisement -

Call your healthcare provider if you ate a McDonald’s Quarter Pounder hamburger and 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

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 E. coli Questions and Answers page.

See also

On This Page

SourcesPrintShare

Content Source:

National Center for Emerging and Zoonotic Infectious Diseases (NCEZID)

- Advertisement -
- Advertisement -

- Advertisement -

More Articles

How Robotic Innovation is Transforming Breast Cancer Surgery

October is Breast Cancer Awareness Month. Reports show one in eight women in the United States will develop breast cancer, and some may have to undergo a mastectomy, which can now be performed robotically.

South Padre Island Steps Up for Breast Cancer Awareness at 2026 Walk for Women, Oct. 4th

South Padre Island will come together in a show of hope, strength and support on Sunday, October 4, for the annual Walk for Breast Cancer Awareness, benefiting South Padre Island’s Walk for Women and its mission to help Rio Grande Valley women and families affected by breast cancer.

DHR Health Offers Mammogram Screening Special During “Breast Cancer Awareness Month”

October is “Breast Cancer Awareness Month,” and DHR Health is encouraging women to prioritize their breast health by offering their annual mammogram screening special.

FDA Approves First Treatment for MCT8 Deficiency

The U.S. Food and Drug Administration approved Emcitate (tiratricol) tablets for oral suspension to treat peripheral thyrotoxicosis (excess thyroid hormone levels in the blood that causes symptoms, such as rapid heart rate, increased blood pressure and adverse effects on metabolism) in patients with MCT8 deficiency, also known as Allan-Herndon-Dudley syndrome.
- Advertisement -