Figure 1 shows the number of people who were sick after attending a school camp in the Northern Territory, by their onset date. Two people were sick on 7/8/2014, ten were sick on 8/8/2014, four were sick on 9/8/2014, seven were sick on 10/8/2014, two were sick on 11/8/2014, four were sick on 12/8/2014 and one was sick on 14/8/2016. The shape of the epicurve is typical of a point source outbreak.