McDonald's E. coli Outbreak: Fast-Food Chains Pull Onions After Taylor Farms Identified As Supplier

A Food and Drug Administration spokesperson announced the agency is investigating Taylor Farms as a potential source of the E. coli outbreak linked to hamburgers. (Credit: Scott Olson/Getty Images)

McDonald's, on Thursday, identified Taylor Farms as the supplier of onions used in the company's Quarter Pounder burgers, which have been removed from menus in several states after a deadly E. coli outbreak.

Following McDonald's, other prominent U.S. fast-food chains, including Burger King and Taco Bell, have removed fresh onions from their menu items.