In order to limit the transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a significant numbers of measures were taken worldwide. It has been shown that the pandemic and its consequences, such as lockdown and isolation, can have a significant long-term impact on the well-being of children.

This study follows the initial DYNAtracs study on SARS-CoV-2 transmission in primary schools. In Belgium, 2488 children and 444 school attenders in 11 primary schools of the Federation Wallonia Brussels are invited. Every participant will be invited to answer a well-being questionnaire. This study aimed to document the children and workers well-being in the primary schools of Belgium after the COVID-19 pandemic. The results of the study should contribute to improved decision making regarding measures for schools and children well-being in the context of current and future pandemics.

The objective of this study is to document the well-being of children and workers after the COVID 19 pandemic in primary schools of the Federation Wallonia-Brussels.

Inclusion Criteria:

• All children between the ages of 6 and 12 years and all school attenders from selected primary schools were invited to participate.

Exclusion Criteria:

• Refusal or absence of written informed consent before enrolment

Sampling procedure for the initial study Eight schools will be chosen by purposive sampling on three criteria: either high or low size of the school, a school within an area with either a high or a low incidence of SARS-CoV-2 on 06/05/2020, the first wave of COVID-19 in Belgium, and a school with either a high or a low socioeconomic level (Belgian 20-point-scale ISE index superior to thirteen or inferior to seven). As direct partners in the project, the ONE ("Office de la naissance et de l'enfance") and the PSE teams ("Promotion de la Santé à l'Ecole") will give a list of schools corresponding to these three criteria.

In this present study, the investigators will return to the same schools as in the previous DYNAtracs study.

All participants will be invited to complete a paper questionnaire.