An E. coli outbreak linked to McDonald’s Quarter Pounders has led to at least 49 illnesses across 10 states, including one death. Here’s what we know. Quarter Pounders made people sick The US Centers for Disease Control and Prevention issued a food safety alert Tuesday warning that dozens of people reported eating the Quarter Pounder sandwich at McDonald’s before becoming sick.

A California grower 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,

Colorado resident Eric Stelly alleges that he became so sick after eating at McDonald's earlier this month that he had to visit an emergency room.