US fast-food chains were pulling fresh onions out of their menu items after the vegetable was named as the likely source of an E coli outbreak at McDonald's restaurants that has sickened 49 people and killed one.
Restaurant Brands International, parent of McDonald's rival Burger King, and Yum Brands said they were removing fresh onions from menu items.
Roughly 5% of Burger King locations have removed onions from the menu, a Burger King spokesperson said in a statement.
McDonald's said that Taylor Farms was the supplier of the sliced onions that have been removed. Taylor Farms did not immediately respond to a request for comment.
The company has recalled several batches of yellow onions produced in a Colorado facility, according to a recall memo on Wednesday by US Foods, one of the largest US suppliers of food service operations.
About 5% of Burger King stores also get supplies from Taylor Farms, but a company spokesperson said Burger King has not been contacted yet from health authorities or had any illnesses.
Yum, which operates KFC, Pizza Hut and the Taco Bell chains, said it was removing onions "out of an abundance of caution."
The US Food and Drug Administration yesterday also confirmed that Taylor Farms was the supplier for the affected McDonald's locations and that the company has initiated a voluntary recall.
"Yellow onions were sold to additional food service customers. Customers who received recalled onions have been directly notified of the recall," an FDA spokesperson told Reuters.
Food distributors including US Foods and Sysco Corp have been notifying customers of the recall.
"Sysco has communicated to customers and a limited number of our sites instructions regarding the supplier-initiated recall of yellow onions," a company spokesperson said.
The US health regulator added that it was working with federal and state partners and the companies involved to investigate if onions are the source of this outbreak.
The US Department of Agriculture said earlier this week that fresh onions were the likely source of the outbreak.
Past E. coli outbreaks have hampered sales at big fast-food restaurants as customers avoid the affected chains for fear of illness.
Regulators are still investigating whether McDonald's beef patties could be affected, but E coli is killed in beef when cooked properly, whereas the McDonald's Quarter Pounder is served with raw, slivered onions.
McDonald's has pulled the Quarter Pounder from about one-fifth of its US restaurants, including in Colorado, Kansas, Utah and Wyoming, and in parts of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico and Oklahoma.
McDonald's has moved quickly to try to contain the damage while also trying to reassure customers of its efforts. That may be critical - previous outbreaks in 2015 at Chipotle Mexican Grill and in 1993 at Jack in the Box caused sales at those companies to drop sharply for several quarters.
David Tarantino, an analyst at Baird Equity Research, downgraded McDonald's shares to "neutral" on Wednesday.
"We are concerned that reports of an E coli outbreak linked to McDonald's restaurants in multiple US states could pose a major threat to consumer sentiment" and thus hurt US comparable-store sales, he said.
