Fig. 2: Relative reduction in infections for different vaccination and previous infection statuses.

Relative reduction in infections after previous infection, primary vaccination, booster vaccination, or combinations of previous infection and vaccination, compared with naïve status ((1-odds ratio (OR)) * 100), by time since last event and overall in persons aged 18 and older, for cohort Delta-Omicron BA.1 (A, n = 258,907) and cohort Omicron BA.1-BA.2 (B, n = 260,653). Error bars represent 95% confidence intervals.