Dozens of people across 13 states have become sick after eating McDonald’s Quarter Pounders contaminated with E. coli. At least 75 people fell ill from the bacterial infection and one person died in Colorado from the O157:H7 strain of E.

A California-based produce company was the source of fresh onions linked to a deadly E. coli food poisoning outbreak at McDonald’s, officials with the restaurant chain said Thursday. Meanwhile, other fast-food restaurants — including Taco Bell, Pizza Hut, KFC and Burger King — pulled onions from some menus.