A California-based produce company was the source of fresh onions linked to a deadly E. coli at McDonaldB次元官网网址檚, officials with the restaurant chain said Thursday.

Meanwhile, other fast-food restaurants B次元官网网址� including Taco Bell, Pizza Hut, KFC and Burger King B次元官网网址� pulled onions from some menus.

McDonaldB次元官网网址檚 officials said that Taylor Farms, of Salinas, California, sent onions to one distribution facility, which led the fast-food chain to from restaurants in several states. McDonaldB次元官网网址檚 didnB次元官网网址檛 say which facility it was.

An outbreak tied to the burgers has sickened at least 49 people in 10 states, including a person who died, federal health officials have said. Investigators said they were as a potential source of the infections.

McDonaldB次元官网网址檚 Canada has said its operations arenB次元官网网址檛 affected, and that none of the affected products or ingredients are used in its restaurants.

U.S. Foods, a major wholesaler to restaurants across the country, said Thursday that Taylor Farms had issued a recall this week for peeled whole and diced yellow onions for potential E. coli contamination. The recalled onions came from a Taylor Farms facility in Colorado, a U.S. Foods spokesperson said. But the wholesaler also noted that it wasnB次元官网网址檛 a McDonaldB次元官网网址檚 supplier and that its recall didnB次元官网网址檛 include any products sold at the fast-food chainB次元官网网址檚 restaurants.

Taylor Farms did not respond to multiple requests for comment.

Officials with the U.S. Food and Drug Administration did not confirm that the agency is investigating Taylor Farms. A spokesperson said Thursday that the agency is B次元官网网址渓ooking at all sourcesB次元官网网址� of the outbreak.

In the meantime, other temporarily stopped using fresh onions.

B次元官网网址淎s we continue to monitor the recently reported E. coli outbreak, and out of an abundance of caution, we have proactively removed fresh onions from select Taco Bell, Pizza Hut and KFC restaurants,B次元官网网址� Yum Brands said in a statement.

Louisville, Kentucky-based Yum Brands wouldnB次元官网网址檛 say where onions were removed or whether the company uses the same supplier as McDonaldB次元官网网址檚. Yum Brands said it will continue to follow guidance from regulators and its suppliers.

Restaurant Brands International, which owns Burger King, said Thursday that 5% of its restaurants use onions distributed by Taylor FarmsB次元官网网址� Colorado facility. Burger King restaurants get deliveries of whole, fresh onions and its employees wash, peel and slice them.

Even though it wasnB次元官网网址檛 contacted by health officials and it had no indications of illness, Restaurant Brands said it asked the restaurants that received onions from the Colorado facility to dispose of them two days ago. The company said itB次元官网网址檚 restocking with onions from other suppliers.

Chipotle said Thursday it doesnB次元官网网址檛 source onions from Taylor Farms or us any other ingredients from the Colorado facility.

Onions have been implicated in . In 2015, Taylor Farms recalled a celery and onion mix used in Costco chicken salads after 19 people were sickened with E. coli. Last year, in an outbreak of salmonella poisoning tied to bagged diced onions from Gills Onions of Oxnard, California. At least 10 people have been hospitalized in the McDonaldB次元官网网址檚 outbreak, including a child who suffered a severe kidney disease complication as a result of the infection. Illnesses were confirmed between Sept. 27 and Oct. 11, according to the U.S. Centers for Disease Control and Prevention.

Victims were infected with E. coli 0157:H7, a type of bacteria that produces a dangerous toxin. It causes about 74,000 infections in the U.S. annually, leading to more than 2,000 hospitalizations and 61 deaths each year, according to CDC.

A Greeley, Colorado, man is suing McDonaldB次元官网网址檚 after contracting an E. coli infection. In a lawsuit filed this week, Eric Stelly said he ate food from local McDonaldB次元官网网址檚 on Oct. 4 and fell ill two days later. After he sought emergency care, health officials confirmed his infection was part of the outbreak.

Symptoms occur of E. coli poisoning can occur quickly, within a day or two of eating contaminated food. They typically include fever, vomiting, diarrhea or bloody diarrhea and signs of dehydration B次元官网网址� little or no peeing, increased thirst and dizziness. The infection is especially dangerous for children younger than 5, people who are elderly, pregnant or who have weakened immune systems.