A deadly E. coli outbreak linked to McDonald's Quarter Pounders has sickened at least 75 people across 13 states, resulting in 22 hospitalizations and one death. The outbreak's epicenter is in Colorado, with 26 reported cases. The CDC suspects slivered onions from Taylor Farms and beef patties as potential sources of contamination, although no definitive source has been confirmed. McDonald's has temporarily removed the Quarter Pounder from its menu in affected states, and Taylor Farms has initiated a recall of the onions. Other fast-food chains, such as Burger King, have also pulled onions from some locations as a precaution. The FDA is investigating the outbreak, and the CDC reports that the public risk is currently considered low.