Seroprevalence among children and in their households.

(A) Age distribution of SARS-CoV-2 seronegative (median 32 years, IQR 19–46) and seropositive (median 25 years, IQR 15–41) individuals. (B) SARS-CoV-2 seroprevalence and 95% CI associated with age, as estimated with a generalized additive model. (C) Distribution of household size by age among SARS-CoV-2 seronegative and seropositive individuals. Seropositive individuals tended to be in larger households compared to seronegative individuals in the same age group. (D) Seroprevalence and 95% CI stratified by age group and presence of children in the household. (E) Variation in seroprevalence among children by household composition (number of children and number of adults). The number of other children in the household was associated with higher seroprevalence, but there was no statistically significant difference between households with 1 adult and those with 2 adults. Asterisks indicate statistically significant differences (2-tailed t test, Bonferroni-adjusted p < 0.05: *; <0.01: **; <0.001: ***; α = 0.01, 0.0125, 0.0167 in panels (C–E). CI, confidence interval; IQR, interquartile range; SARS-CoV-2, Severe Acute Respiratory Syndrome Coronavirus 2.