McDonaldB次元官网网址檚 announced Sunday that Quarter Pounders will again be on its menu at hundreds of its restaurants after testing as the source of the tied to the popular burgers that killed one person and sickened at least 75 others across 13 states.

The U.S. Food and Drug Administration continues to believe that slivered onions from a single supplier are the likely source of contamination, McDonaldB次元官网网址檚 said in a statement. It said it will resume selling the Quarter Pounder at affected restaurants B次元官网网址�- without slivered onions B次元官网网址� in the coming week.

As of Friday, the outbreak had expanded to at least 75 people sick in 13 states, federal health officials said. A total of 22 people had been hospitalized, and two developed a dangerous kidney disease complication, the Centers for Disease Control and Prevention said. One person has died in Colorado.

Early information analyzed by the FDA showed that uncooked slivered onions used on the burgers B次元官网网址渁re a likely source of contamination,B次元官网网址� the agency said. that Taylor Farms, a California-based produce company, was the supplier of the fresh onions used in the restaurants involved in the outbreak, and that they had come from a facility in Colorado Springs, Colorado.

McDonaldB次元官网网址檚 pulled the Quarter Pounder burger from menus in several states B次元官网网址� mostly in the Midwest and Mountain states B次元官网网址� when the outbreak was announced Tuesday. McDonaldB次元官网网址檚 said Friday that slivered onions from the Colorado Springs facility were distributed to approximately 900 of its restaurants, including some in transportation hubs like airports.

The company said it removed slivered onions sourced from that facility from its supply chain on Tuesday. McDonaldB次元官网网址檚 said it has decided to stop sourcing onions from Taylor FarmsB次元官网网址� Colorado Springs facility B次元官网网址渋ndefinitely.B次元官网网址�

The 900 McDonaldB次元官网网址檚 restaurants that normally received slivered onions from Taylor FarmsB次元官网网址� Colorado Springs facility will resume sales of Quarter Pounders without slivered onions, McDonaldB次元官网网址檚 said.

Testing by the Colorado Department of Agriculture ruled out beef patties as the source of the outbreak, McDonaldB次元官网网址檚 said.

The department of agriculture received multiple lots of fresh and frozen beef patties collected from various Colorado McDonaldB次元官网网址檚 locations associated with the E. coli investigation. All samples were found to be negative for E. coli, the department said.

Taylor Farms said Friday that it had preemptively recalled yellow onions sent to its customers from its Colorado facility and continues to work with the CDC and the FDA as they investigate.

While it remains unclear if the recalled onions were the source of the outbreak, several 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 in certain areas this week.

Colorado had the most illnesses reported as of Friday, with 26 cases. At least 13 people were sickened in Montana, 11 in Nebraska, 5 each in New Mexico and Utah, 4 each in Missouri and Wyoming, two in Michigan and one each in Iowa, Kansas, Oregon, Wisconsin and Washington, the CDC reported.

McDonaldB次元官网网址檚 said Friday it didnB次元官网网址檛 pull the Quarter Pounder from any additional restaurants and noted that some cases in states outside the original region were tied to travel.

The CDC said some people who got sick reported traveling to other states before their symptoms started. At least three people said they ate at McDonaldB次元官网网址檚 during their travel. Illnesses were reported between Sept. 27 and Oct. 11.

The outbreak involves infections 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.

Symptoms 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.