1 dead in multistate E. coli outbreak tied to McDonald's Quarter Pounders, CDC says

The US Centers for Disease Control and Prevention issued a food safety alert Tuesday regarding an E. coli outbreak that it says is linked with McDonald's Quarter Pounders.

At least 49 illnesses have been reported across 10 states, including one death of an older person. Ten people have been hospitalized, including a child who had hemolytic uremic syndrome, a serious complication that can develop from an E. coli infection. Most of the illnesses are in Colorado and Nebraska.

Most of the people who became ill reported eating McDonald's Quarter Pounder sandwiches, the CDC says.

The agency says the investigation is "fast-moving" but has not identified a specific ingredient. However, investigators are focusing on two ingredients: slivered onions and beef patties. According to the agency, the beef patties are used just for the Quarter Pounders, and the onions are used primarily for the Quarter Pounder and not other items.

McDonald's said in a statement that the initial investigation findings linked the ingredients to "a single supplier that serves three distribution centers."

"We are working in close partnership with our suppliers to replenish supply for the Quarter Pounder in the coming weeks (timing will vary by local market)," it said. "In the meantime, all other menu items, including other beef products (including the Cheeseburger, Hamburger, Big Mac, McDouble and the Double Cheeseburger) are unaffected and available."

According to the CDC, McDonald's has removed the ingredients from stores in Colorado, Iowa, Kansas, Missouri, Montana, Nebraska, Oregon, Utah, Wisconsin and Wyoming. In other states, Quarter Pounder burgers may not be available.

However, the CDC also notes that the outbreak may go beyond those states.

People with E. coli infections may have symptoms including severe stomach cramps, diarrhea, fever and vomiting. Symptoms of infection usually begin three or four days after swallowing the bacteria. Although most people who become ill recover without treatment within a week, others can develop serious kidney problems and require hospitalization.

Anyone who becomes ill after eating a McDonald's Quarter Pounder should get medical attention and tell the provider what they ate, the CDC says.

McDonald's said in its statement that "serving customers safely in every single restaurant, each and every day, is our top priority" and that it will continue working with the CDC on the investigation.

McDonald's stock price dropped precipitously in after-hours trading as news of the outbreak broke.

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