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Objective To investigate the comparative vaccine effectiveness of heterologous booster schedules (ie, three vaccine doses) compared with primary schedules (two vaccine doses) and with homologous mRNA vaccine booster schedules (three vaccine doses) during a period of omicron predominance. Design Population based cohort analyses. Setting Denmark, Finland, Norway, and Sweden, 27 December 2020 to 31 December 2022. Participants All adults aged ≥18 years who had received at least a primary vaccination schedule of AZD1222 (Oxford-AstraZeneca) or monovalent SARS-CoV-2 wild type (ancestral) strain based mRNA vaccines BNT162b2 (Pfizer-BioNTech) or mRNA-1273 (Moderna), in any combination. Main outcome measures The main outcome measure was country combined risks of covid-19 related hospital admission and death with covid-19 and additional outcomes of covid-19 related admission to an intensive care unit and SARS-CoV-2 infection. During a period of omicron predominance, these outcomes were com

United kingdomKarolinska institutetMorten andersenLars christian lundUlrike baumCoronavac sinovacAnders hviidJostein starrfeltEero poukkaJesper hallasNicklas pihlstrHinta meijerinkS janssen johnsonJesper kjChristian holm hansenMathijs goossens