(CNN) — McDonald’s will resume selling Quarter Pounders at all restaurants next week after reviewing new data regarding an E. coli outbreak. coli linked to its famous hamburgers, the company announced Sunday.

The United States Centers for Disease Control and Prevention has published a food safety alert On Tuesday, dozens of people reported eating the Quarter Pounder sandwich at McDonald’s before getting sick.

The epidemic of E. coli caused 75 cases of illness in 13 states, including 22 hospitalizations and one death, according to According to the latest information from the CDC, most of the 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 sliced ​​onions or beef patties from Quarter Pounder sandwiches are the likely source of contamination.

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 its ability to rule out fresh beef patties as a source of contamination, according to a Sunday press release.

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, according to the release. said.

The 900 restaurants that received sliced ​​onions from McDonald’s supplier Taylor Farms’ Colorado Springs plant will resume sales of Quarter Pounders without sliced ​​onions, according to 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,” he says.

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 report. releasewhich does 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.”

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

“I know our relationship is built on trust,” McDonald’s U.S. President Joe Erlinger said in a statement. video message posted on 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. »

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