Figure 2:

Cumulative vaccine- and infection-induced SARS-CoV-2 seroprevalence by age group, sixth to tenth serosurveys, in the Lower Mainland, British Columbia, Canada (September 2021–July 2023). (A) Side-by-side comparison of the sixth to ninth serosurveys to illustrate seroprevalence progression. (B) Ninth and tenth serosurveys, presented separately for comparison of recent age-related patterns. Detailed findings are provided in Table 2. Darker bars indicate infection-induced seroprevalence. Lighter bars, combined with the darker bars, indicate overall (vaccine-induced, infection-induced or both) seroprevalence. Infection-induced estimates were defined by anti-nucleocapsid positivity. Overall estimates were defined by anti-spike or anti-nucleocapsid positivity. Estimates were based on Bayesian analyses, standardized for age, sex and health authority. Estimates from the sixth to eighth serosurveys are updated from our previous study,⁹ consistently applying the same nonorthogonal approach. Note: CrI = credible interval.