Figure 2.

Reverse-transcriptase polymerase chain reaction (RT-PCR) and antigen-detection rapid diagnostic test (Ag-RDT) positivity by day past symptom onset (DPSO). Filled lines represent RT-PCR results; dashed lines, Ag-RDT results; and shaded regions, 95% confidence intervals. Percent positivity of Ag-RDT and RT-PCR by DPSO is shown among adults (black) and children (green) (A), individuals with the Delta (black) and Omicron (green) variants (B), unvaccinated (black) and vaccinated (green) individuals (C), and female (black) and male (green) participants (D). Percent positivity was defined as the number of participants with a positive result (Ag-RDT or RT-PCR) on each DPSO divided by the number of participants who tested positive on RT-PCR at least once during the observation period (DPSO −14 to 14) and recorded a test on that specific DPSO.