On Nov. 13, 2024, the U.S. Food and Drug Administration (FDA) and the U.S. Centers for Disease Control (CDC) reported that the investigation of a multistate outbreak of E. coli O157:H7 linked to slivered onions served on Quarter Pounder burgers at McDonald’s restaurants in certain states was ongoing.

To date, 104 people infected with the outbreak strain of E. coli O157:H7 have been reported from 14 states. Of 98 people with information available, 34 were hospitalized, and 4 people developed HUS, a serious condition that can cause kidney failure. One death was reported from an older adult in Colorado.

The FDA has completed onsite inspections at a Taylor Farms processing center in Colorado and an onion grower of interest in Washington state.