LOS ANGELES– McDonald’s will resume the sale of Quarter Pounders at all restaurants in the coming week after reviewing new data regarding an E. coli outbreak. coli linked to its famous hamburgers, the company announced Sunday.

The U.S. Centers for Disease Control and Prevention issued a food safety alert Tuesday warning dozens of people who reported eating the Quarter Pounder sandwich at McDonald’s before becoming ill.

The epidemic of E. coli led to 75 illnesses in 13 states, including 22 hospitalizations and one deathaccording to the latest information from the CDC, most associated illnesses occur in Colorado.

No specific ingredient has been confirmed to cause the outbreak, federal agencies said Friday, but the U.S. Food and Drug Administration previously said that sliced ​​onions or beef patties in sandwiches Quarter Pounder were the likely source of contamination.

On Sunday, the Colorado Department of Agriculture said McDonald’s beef patties used for the Quarter Pounder tested negative for E. coli. The department tested fresh patties from restaurants associated with the outbreak.

Based on the Colorado Department of Agriculture’s findings and after comparing CDC data with its own supply chain data, McDonald’s is confident in excluding fresh beef patties as a source of contamination, according to a press release issued on Sunday.

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The company is now asking beef suppliers to produce a new offering of fresh beef patties, and the Quarter Pounder is expected to be available in all restaurants in the coming week, the release said.

The 900 restaurants that received sliced ​​onions from McDonald’s supplier Taylor Farms’ Colorado Springs facility will resume sales of Quarter Pounders without chopped onions, the release added. “These restaurants are found in Colorado, Kansas and Wyoming, as well as parts of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico, Oklahoma and Utah,” the statement said.

The FDA and CDC say they continue to work with partners to investigate the source of the outbreak. CNN contacted the FDA to see if it had ruled out beef patties as the source of the E. coli. Contacted by CNN on Sunday, the CDC referred to its Friday statement, which did not specify a specific ingredient as the cause.

“The FDA is using all available tools to confirm whether onions are the cause of this outbreak,” a spokesperson previously said. “The FDA and partner states also collect onion samples for analysis.”

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Taylor Farms removed yellow onions from the market “out of an abundance of caution,” the company said in a statement Wednesday, and distributor US Foods recalled four onion products due to “potential contamination with E. coli”.

“I know our relationship is built on trust,” McDonald’s U.S. President Joe Erlinger said in a video message released Sunday. “You trust us to serve you safe food every time.”

“On behalf of the McDonald’s system, I want you to hear from me: We are sorry,” Erlinger added. “For affected customers, you have my commitment that, guided by our values, we will remedy the situation.”