As of May 1, 2018, 121 people infected with the outbreak strain of E. coli O157:H7 have been reported from 25 states. A list of the states and the number of cases in each can be found on the Case Count Map page. Illnesses started on dates ranging from March 13, 2018 to April 21, 2018. Ill people range in age from 1 to 88 years, with a median age of 29. Sixty-three percent of ill people are female. Of 102 people with information available, 52 (51%) have been hospitalized, including 14 people who developed hemolytic uremic syndrome, a type of kidney failure. One death was reported from California.

Illnesses that occurred after April 11, 2018, might not yet be reported due to the time it takes between when a person becomes ill with E. coli and when the illness is reported. This takes an average of two to three weeks.