Appendix 1—figure 23. Validation of the seroprevalence estimates using infection fatality rate (IFR) extrapolation.

(A) Seroprevalence obtained by extrapolating the IFR measured in June 2020 to the following months. The seroprevalence was obtained by dividing the cumulative number of deaths in each month by the IFR estimated for June 2020. (B) Age-specific IFR estimated in June 2020. Cities with small attack rate in June 2020 as Belo Horizonte and Curitiba present a large uncertainty in the estimated IFR.