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Geometric mean IgG titers (with 95% CI) against ancestor SARS-CoV-2 on Days 0, 28 and 84 after a booster vaccination with protein SCB-2019, adenovirus-vector ChAdOx1-S or mRNA BNT162b2 COVID-19 vaccines according to previous booster history (PPS excluding cases of COVID-19 during the study).
