The deadly outbreak spurred a recall of onions by a major food supplier in the Mountain West. Taco Bell, KFC and Pizza Hut have stopped serving onions with their menu offerings at various locations.

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,

Fresh onions are the likely source of an E. coli outbreak at McDonald's restaurants that has sickened 49 people and killed one, the U.S. Department of Agriculture said late on Wednesday, alarming some McDonald's customers and other fast-food chains using onions as an ingredient.

Taylor Farms recalled some yellow onions, citing potential E. coli contamination. The company is a major supplier to McDonald's.

McDonald’s Corp. supplier Taylor Farms is recalling some yellow onion batches produced in a Colorado facility in response to a deadly E. coli outbreak at the burger chain.

Taylor Farms has issued a recall on raw onions after preliminary data from the U.S. Food and Drug Administration indicated the ingredient as "a likely source of contamination" in a deadly E. coli outbreak linked to McDonald's Quarter Pounders.

Just days after an E. coli outbreak tied to McDonald's Quarter Pounders was first announced, a company producing onions used in the burgers