Safety and immunogenicity of Ad26.COV2.S in adults: A randomised, double-blind, placebo-controlled Phase 2a dose-finding study.

Cárdenas V, Le Gars M, Truyers C, Ruiz-Guiñazú J, Struyf F, Colfer A, Bonten M, Borobia A, Reisinger EC, Kamerling IMC, Douoguih M, Sadoff J

A single dose of Ad26.COV2.S is well-tolerated and effective in preventing moderate-to-severe disease outcomes due to COVID-19. We evaluated the impact of dose level, number of doses, and dose interval on immunogenicity, reactogenicity, and safety of Ad26.COV2.S in adults. Anamnestic responses were also explored.