A total of 104 people infected with the outbreak strain of E. coli O157:H7 were reported from 14 states. Illnesses started on dates ranging from September 12,2024, to October 21, 2024. Of 98 people with information available, 34 were hospitalized, and 4 people developed hemolytic uremic syndrome (HUS), a serious condition that can cause kidney failure. One death was reported from an older adult in Colorado. This person was not one of those who developed HUS.

Epidemiologic and traceback data showed that fresh, slivered onions produced by Taylor Farms served at McDonald’s were the likely source of this outbreak.