Fig. 3. Undiagnosed SARS-CoV-2 seroprevalence in the main demographic categories.

Six main categories were used during quota-based sampling: region, age, sex, race, ethnicity, and urban/rural. Seropositivity estimates of blood samples that had a full clinical questionnaire completed and successful sampling are shown. Data are weighted estimates ± 95% CIs. Black dashed vertical line, weighted national seroprevalence estimate; *, n value too low to make a proper weighted estimate so raw positivity is displayed.