Important to note that effectiveness is a relative term. One thing they ought to track in these studies is infections in both the boosted group and control gro

Important to note that effectiveness is a relative term. One thing they ought to track in these studies is infections in both the boosted group and control group. Effectiveness can wane for multiple reasons: 1. Antibodies want 2. Variants shift and the booster is less effective 3. The control group caught covid and gained immunity If your control group gets infected and gains immunity, the booster will seem less effective. But it wasn't waning, unlike causes #1 or #2. The study period ends Oct 2022. 2022 was the year most of the population caught sars-cov-2 at some point.