Infections with the outbreak strain of E. coli O157:H7 by known or estimated illness onset date

N=14 for whom information was reported as of 3/22/11

The outbreak can be visually described with a chart showing the number of persons who became ill each day. This chart is called an epidemic curve or epi curve. Illnesses that occurred after March 23, 2011 might not yet be reported due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 3 weeks.