Persons infected with the outbreak strain of E. coli O157:H7 by date of illness onset*

*n= 58 for whom information was reported as of March 21, 2012

Among persons for whom information was available, illnesses began from October 9, 2011 to November 7, 2011. Ill persons ranged in age from 1 to 94 years, with a median age of 28 years. Fifty-nine percent were female. Among the 49 ill persons with available information, 33 (67%) were hospitalized, and 3 developed hemolytic uremic syndrome (HUS). No deaths were reported.

The outbreak can be visually described with a chart showing the number of people who became ill each day. This chart is called an epidemic curve or epi curve. Please see the Timeline for Reporting of E. coli Cases for more details.