Table 2.
Clinical sensitivity of SARS-CoV-2 nucleocapsid antigen for the diagnosis of COVID-19 in plasma samples, subset by weeks from symptom onset.
| Week after symptom onseta | Plasma SARS-CoV-2 nucleocapsid antigen |
|||
|---|---|---|---|---|
| Positive, n | Negative, n | Total, n | Sensitivity (95% CI), % |
|
| 1 | 44 | 5 | 49 | 89.8 (77.8–96.6) |
| 2 | 64 | 6 | 70 | 91.4 (82.3–96.8) |
| 3 | 35 | 12 | 47 | 74.5 (59.7–86.1) |
| 4 | 16 | 14 | 30 | 53.3 (34.3–71.7) |
| 5 | 9 | 15 | 24 | 37.5 (18.8–59.4) |
| 6 | 8 | 14 | 22 | 36.4 (17.2–59.3) |
| 7+ | 5 | 30 | 35 | 14.3 (4.8–30.26) |
a
If an individual had more than 1 plasma sample taken within the same week, only the first 1 was included. As such, each row contains only 1 sample per individual.