(CNN) 鈥� McDonald鈥檚 will resume selling Quarter Pounders in all restaurants this week after considering new data regarding an E. coli outbreak linked to its famed burgers, the company announced Sunday.
The US Centers for Disease Control and Prevention聽issued a聽聽Tuesday warning that dozens of people had reported eating the Quarter Pounder sandwich at McDonald鈥檚 before becoming sick.
The E. coli outbreak has led to at least 75 illness across 13 states, including 22 hospitalizations and one death,聽to the CDC. Most of the illnesses were n Colorado.
A聽specific ingredient has not been confirmed as the source of the outbreak,聽but the US Food and Drug Administration聽聽last week that the slivered onions or beef patties on Quarter Pounder sandwiches are the most likely source of contamination.
The US Department of Agriculture鈥檚 Food Safety and Inspection Service said Monday that evidence does not point to ground beef as the probable source of the E. coli outbreak.
鈥淔SIS has conducted a thorough investigation in response to this outbreak, including traceback of beef patties served on Quarter Pounders at McDonald鈥檚,鈥� the agency said in a statement. 鈥淔SIS used specific meal information reported by ill people to trace beef patties through the supply chain to the establishment where they were produced and did not identify a beef source.鈥�
On Sunday, the Colorado Department of Agriculture that McDonald鈥檚聽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 findings from that testing and after comparing CDC data with its own supply chain data,聽McDonald鈥檚聽is confident in ruling out fresh beef patties as a source of contamination, the company said in .
It鈥檚 now asking beef suppliers to produce a new supply of fresh beef patties, and聽the Quarter Pounder is expected to be聽available in all restaurants in the coming week, the聽release聽.
The 900 restaurants that received slivered onions from supplier Taylor Farms鈥� Colorado Springs facility聽will resume sales of Quarter Pounders without聽slivered onions,聽the release聽. 鈥淭hose restaurants are in Colorado, Kansas, and Wyoming, as well as portions of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico, Oklahoma, and Utah,鈥� it said.
The FDA, the USDA and the CDC say they are continuing to work with partners to investigate the source of the outbreak.
Taylor Farms removed yellow onions from the market 鈥渙ut of an abundance of caution,鈥� the company said in a statement Wednesday,聽and distributor US Foods has聽issued a recall of four onion products due to 鈥減otential E. coli contamination.鈥�
鈥淚 know that our relationship is built on trust,鈥� McDonald鈥檚 US President Joe Erlinger said in a聽聽message posted Sunday. 鈥淵ou trust us to serve you safe food every time.鈥�
鈥淥n behalf of the McDonald鈥檚聽system, I want you to hear from me: we are sorry,鈥� Erlinger聽added. 鈥淔or those customers affected, you have my commitment that, led by our values, we will make this right.鈥�
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