Onions are likely source of deadly McDonald’s E Coli outbreak, USDA says

Batches of the vegetable produced in Colorado, where many people fell ill after eating Quarter Pounders, were recalled

Fresh onions are the probable source of an E coli outbreak at McDonald's restaurants that has sickened 49 people and killed one, the US Department of Agriculture said, alarming fast food chains using the ingredient.

Taylor Farms, a supplier for McDonald's, the biggest US burger chain, recalled several batches of yellow onions produced in a Colorado facility, according to a memo on Wednesday by US Foods, one of the largest suppliers of food service operations in the country.