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. 2022 Apr 4;12(4):e057846. doi: 10.1136/bmjopen-2021-057846

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Weekly reported COVID-19 cases among all school staff and students of the Vancouver School District, compared with all Vancouver residents. Seven-day average of new SARS-CoV-2 cases among Vancouver residents and dates of serology collection. Median date of completion of questionnaire was 4 March. Dotted line shows total weekly Vancouver resident COVID-19 cases. Plain line shows total weekly cases among all students and staff from the Vancouver School District. Dashed line shows cumulative weekly serology tests performed among school staff sample. Grey background denotes when public school was in session.