A coalition of federal, state, and local organizations announced on Tuesday, October 22, 2024, that it is investigating reports of E. coli O157:H7 infections across several states. In a preliminary statement issued by the FDA, the agency says that no one ingredient has been confirmed as the source of the outbreak, but most of those stricken reported eating some version of a McDonald’s Quarter Pounder. The response coalition includes the FDA, along with the CDC, the USDA, and the Food Safety and Inspection Service (FSIS), according to a release shared with Chowhound.