FIGURE 1.

Distribution of viral infections from 9 March to 28 February, 2016–2017 (pre‐pandemic) and 2020–2021 (pandemic). The white area indicates when schools were closed and the grey area indicates when schools were open. The strict lockdown period lasted from 9 March to 3 May 2020, and this was followed by 2 periods of more relaxed restrictions. (A) 2016–2017. Schools were opened until June 2016 and then from September 2016 until the end of the observational period. (B) 2020–2021. Schools were closed during the strict lockdown period and summer and reopened from September 2020 until the end of the observational period