McDonald’s announced Sunday that Quarter Pounders will again be on its menu at hundreds of its restaurants after testing ruled out beef patties as the source of the outbreak of E. coli poisoning tied to the popular burgers that killed one person and sickened at least 75 others across 13 states.

McDonald's will resume selling Quarter Pounder hamburgers in all restaurants this week, as it was informed results of testing showed no detection of E.coli in the beef patties, the U.S. fast-food giant said.

McDonald’s has announced it will put its Quarter Pounder burgers back on the menu at hundreds of restaurants after testing ruled out beef patties as the source of the deadly E. coli outbreak. NBC’s Maggie Vespa reports for TODAY.