Illnesses linked to onions served on Quarter Pounders have been detected in 14 states, and infection killed one person

McDonald’s Quarter Pounder hamburgers are to blame for sickening at least 104 people – and hospitalizing at least 34 – after an outbreak of E coli was tied to onions served on the burgers, federal health officials said on Wednesday.

Cases have been detected in 14 states, according to an update from the US Centers for Disease Control and Prevention. One person died in Colorado and four people have developed a potentially life-threatening kidney disease complication.