Research Article

Influence of School Year on Seasonality of Norovirus Outbreaks in Developed Countries

Figure 4

Comparison of type of school year with outbreak timing. School time is shaded and vacation time is shown in white. These dates are calculated based on median dates of the applicable data sets. If the majority of the median holiday dates was past mid-month, the holiday was considered to be the last 2 weeks of the month, if the majority of the median holiday dates was prior to mid-month, the holiday was considered to be in the first 2 weeks of the month.