McDonald’s is reinstating Quarter Pounders at locations where sales were paused due to an E. coli outbreak that sickened dozens and resulted in one death, as beef has been ruled out as the source of contamination.

Colorado’s Department of Agriculture found no E. coli in beef patties tested from affected restaurants.

McDonald’s is now allowing its beef suppliers to resume production, with Quarter Pounders expected back in stores within a week, though slivered onions will remain unavailable.

The FDA is investigating Taylor Farms, which supplied the onions linked to the outbreak, prompting McDonald’s to remove onions from its supply chain, Fox Business has reported.

The outbreak has resulted in 75 reported E. coli infections across 13 states, with 22 hospitalizations.

Written by B.C. Begley