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.

All contaminated products related to the E. coli outbreak that sickened 75 people across 13 states, with one reported fatality, are now fully out of McDonald's restaurants, the company said in a statement Sunday.

McDonald's Quarter Pounder beef patties were determined not to be the source of an E. coli outbreak following testing, the fast food giant and Colorado health officials said Sunday. Why it matters: The company said it would resume selling the burgers after Colorado Department of Agriculture test results showed no traces of E.