Acknowledgements
INFECTIOUS DISEASES, SECONDARY
All participants: Primary and secondary schools, school staff, pupils and their parentsBiological sample collection: All participating nursesBiological sample transportation: Sciensano’s Sample Management (BBC transport services)Biological sample analysis: Caroline Rodeghiero and Fabienne Jurion, expert technicians at the Department of Infectious Diseases in Humans, Immune Response, Sciensano, Brussels, BelgiumThis study was funded by the Belgian government (COVID-19 SC_044A) through Sciensano, the Belgian institute of Public Health, Brussels, Belgium. Sciensano was involved in all stages of the study, from conception and implementation to analysis and reporting.