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Additional file 1. Table S1. Reported symptoms of all participants with sample collected (and tested) for serologic antibody test on same day as sample that resulted in RT-PCR positive for SARS-CoV-2 (n=492); no symptom duration outliers excluded. Table S2. Reported symptoms of all participants with sample collected (and tested) for serologic antibody test on same day as sample that resulted in RT-PCR positive for SARS-CoV-2 (n=492); mild and extreme symptom duration outliers excluded. Table S3. Sensitivity of the rapid antibody test# by symptom duration and outlier exclusion criteria. Fig. S1. Plots of antibody test sensitivity against the number of weeks since onset of symptoms among those who reported at least one symptom before testing, using the RT-PCR test as the reference, stratified by the types of outliers excluded in the analysis: extreme outliers, which were defined as persons whose time since symptom onset was longer than the third quartile plus 3 times the interquartile range (IQR, defined as the difference between the first and third quartile of the reported times since onset for a given symptom); mild outliers were those beyond the third quartile plus 1.5 times the IQR); or no outliers excluded. The circles show the crude estimated sensitivity and the error bars show the Wilson’s score 95% confidence intervals. The plotted lines are the fitted segmented linear regressions for the rapid antibody tests. Table S4. Segmented regression analyses of antibody test sensitivity by weeks since symptom onset, by symptom duration outlier exclusion criteria. Table S5. Overall antibody test sensitivity* per week since symptom onset for common symptoms. Table S6.Segmented regression analyses of antibody test sensitivity versus weeks since symptom onset, by symptom.

Additional file 1 : Supplementary Information, Table S1, Figure S1-S2. Supplementary Information – Log-Gaussian Cox process details and hierarchical Bayesian spatial model details. Table S1- Hierarchical Bayesian spatial model posterior parameter estimates. Fig S1 – Sensitivity analysis to child and adult age cut-offs. Fig S2 – Sensitivity analysis to grid size.