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Jonker, Lotte (author), Linde, Kimberly J. (author), de Boer, Annemarijn R. (author), Ding, Er (author), Zhang, D. (author), de Hoog, M.L.A. (author), Herfst, Sander (author), Heederik, Dick (author), Bluyssen, P.M. (author)Introduction: Our aim was to gain insight into the effect of COVID-19 measures on SARS-CoV-2 incidence in secondary schools and the association with classroom CO <sub>2</sub> concentration and airborne contamination. Methods: Between October 2020—June 2021, 18 schools weekly reported SARS-CoV-2 incidence and completed surveys on school...journal article 2023