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BCOS study schema. Blood samples were collected from participants prior to the first dose of a COVID-19 vaccination (V0), 28 (±3 days) after the first dose of a ChAdOx1-S (V1) and 28 (±3 days) after the second dose of ChAdOx1-S or BNT162b2 (V2). Created with BioRender.com.
