Vaccine effectiveness against SARS-CoV-2 infection, hospitalization, and death when combining a first dose ChAdOx1 vaccine with a subsequent mRNA vaccine in Denmark: A nationwide population-based cohort study.
Mie Agermose GramJens NielsenAstrid Blicher ScheldeKatrine Finderup NielsenIda Rask Moustsen-HelmsAnne Katrine Bjørkholt SørensenPalle Valentiner-BranthHanne-Dorthe EmborgPublished in: PLoS medicine (2021)
In this study, we observed a large reduction in the risk of SARS-CoV-2 infection when combining the ChAdOx1 and an mRNA vaccine, compared with unvaccinated individuals.