October 22, 2024

The FDA, U.S. Department of Agriculture (USDA) Food Safety and Inspection Service (FSIS), and Centers for Disease Control and Prevention (CDC), in collaboration with state and local partners, are investigating illnesses in a multistate outbreak of E. coli O157:H7 infections. A specific ingredient has not yet been confirmed as the source of the outbreak, but most sick people report eating McDonald’s Quarter Pounder burger varieties.

Investigators are working to determine if the slivered onions or beef patties on Quarter Pounder burgers are the likely source of this outbreak.