Things appear to be going from bad to worse for McDonald’s, after the fast food chain became the center of a full-on E. coli outbreak linked its Quarter Pounders.
So far, one person has died and 10 have been hospitalized after 49 cases of E. coli were reported from customers who ate at McDonald’s restaurants in 10 states across the U.S., according to the Centers for Disease Control and Prevention (CDC).
While it’s not yet clear which specific food ingredient is contaminated, McDonald’s has stopped using fresh slivered onions and quarter pound beef patties in several states while the investigation is ongoing, in order to identify what’s causing the illnesses, per the CDC. (Diced onions and other types of beef patties used at McDonald’s have not been implicated in this outbreak.)
Quarter Pounder hamburgers will not be available temporarily in some states while McDonald’s makes some supply changes.
Which states have been affected by the McDonald’s E. coli outbreak?
There are 10 states where people have become sick: Oregon (1 case), Kansas (1 case), Utah (4 cases), Wyoming (4 cases), Iowa (1 case), Missouri (1 case), Montana (1 case), and Wisconsin (1 case), with most illnesses in Colorado (26 cases) and Nebraska (9 cases).
McDonald’s has temporarily stopped using Quarter Pounder slivered onions and beef patties in these states: Colorado, Kansas, Utah, Wyoming, and portions of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico, and Oklahoma.
Here’s a map that shows where the 49 people affected by the outbreak were located:
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Timeline of when people got sick
This chart from the CDC shows when the 49 people in this E. coli outbreak got sick, with the highest number of people falling ill on October 7.
The CDC found that the illnesses started on September 27, and documented them through October 11. Of 28 people with information available, 10 have been hospitalized and 1 person developed hemolytic uremic syndrome, a serious condition that can cause kidney failure. One death has been reported from an older adult in Colorado (this was not the same person with hemolytic uremic syndrome).
One tricky thing about E. coli is that recent illnesses may not yet be reported, because it usually takes 3 to 4 weeks to determine if a sick person is part of an outbreak.
The actual number of sick people in this outbreak is likely much higher than the number reported, and the outbreak may not be limited to the states with known illnesses. This is partly because many people recover without medical care and are not tested for E. coli.
What should I do if I ate at McDonald’s?
The Food and Drug Administration (FDA) recommends consumers who have already eaten at McDonald’s and have symptoms of E. coli infection should contact their health care provider to report their symptoms and receive care immediately.
What are the symptoms of E. coli?
Symptoms depend on the kind of E. coli causing the infection. Most people with E. coli have diarrhea that can be bloody or watery, or stomach cramps that can be severe. Some people also have vomiting or a low fever.
The CDC recommends you call your doctor if you have these symptoms:
Diarrhea or vomiting lasting more than 2 days
Bloody poop or pee
A fever higher than 102°F
Signs of dehydration
Signs of hemolytic uremic syndrome, which can lead to kidney failure or death
