Fig. 6: Adjusted cumulative hazard rate of SARS-CoV-2 infections.
From: Effect of booster vaccination against Delta and Omicron SARS-CoV-2 variants in Iceland

A–C Infections caused by the Delta variant July 1–November 22, 2021. D–F Infections caused by the Delta variant December 1, 2021–January 8, 2022. G–I Infections caused by the Omicron variant December 1–January 8, 2022. Top row: Recommended vaccine schedules. Middle row: Comparison of mRNA booster vaccination of Ad26.COV2.S recipients with BNT162b2-BNT162b2 as reference. Bottom row: Comparison of three dose vaccination with more than 5000 vaccinees, using BNT162b2-BNT162b2 as reference.