Health officials say that recalls of onions — the suspected source of the contamination — would help lessen the risk to consumers. Other major fast-food chains have also stopped offering onions. Food Contamination and Poisoning, Fast Food Industry, E Coli (Bacteria), Recalls and Bans of Products, Regulation and Deregulation of Industry, Meat, Onions, Hamburgers, Burger King Corp, Centers for Disease Control and Prevention, Food and Drug Administration, McDonald’s Corporation, Taylor Farms, Kentucky Fried Chicken, Pizza Hut, Colorado, Content Type: Service Health officials say that recalls of onions — the suspected source of the contamination — would help lessen the risk to consumers. Other major fast-food chains have also stopped offering onions. NYT > Business