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Antigen-positive percentage agreement (PPA) stratified by PCR-Ct values shown for day 1 (d1) and day 3 (d3), respectively. n.c. = not calculable.
| RT-PCR (Ct) | >10–15 | >15–20 | >20–25 | >25–30 | >30–35 | >35 |
|---|---|---|---|---|---|---|
| d1 (d3) | d1 (d3) | d1 (d3) | d1 (d3) | d1 (d3) | d1 (d3) | |
| Ag-positive | 2 (1) | 4 (2) | 6 (4) | 2 (7) | 1 (1) | 0 (1) |
| Ag-negative | 1 (0) | 3 (0) | 0 (0) | 1 (1) | 0 (2) | 0 (1) |
| PPA | 66.7% (100%) |
57.1% (100%) |
100% (100%) |
66.7% (87.5%) |
100% (33.3%) |
n.c. (50%) |
