Figure 2. Estimated Cumulative Incidence of Symptomatic Omicron Infection in the Matched Booster and Nonbooster Cohorts.

Shown are Kaplan–Meier estimates of the cumulative incidence of symptomatic infection with the omicron variant of SARS-CoV-2, according to the type and number of doses of vaccine received. IQR denotes interquartile range.