Table 1.
Positive rate of Abbott SARS-CoV-2 IgM and IgG assays. Values in parentheses represent 95 % confidence interval.
| Time after symptom onset | IgM | n | IgG | n |
|---|---|---|---|---|
| 0−7d | 24.6 % (16.8−32.3) | 132 | 23.2 % (16.1−30.2) | 138 |
| 8−14d | 75.3 % (70.8−79.7) | 360 | 69.5 % (64.8−74.2) | 367 |
| 15−21d | 95.0 % (92.5−97.4) | 297 | 93.6 % (90.8−96.4) | 297 |
| 4−5w | 96.0 % (93.5−98.4) | 247 | 99.6 % (98.8−100.0) | 248 |
| 6−7w* | 92.7 % (88.8−96.5) | 177 | 99.4% (98.3−100.0) | 179 |
| 8−9w* | 84.5 % (76.1−92.5) | 71 | 97.2% (93.3−100.0) | 71 |
| 10w-<3m | 91.4 % (82.2−100.0) | 35 | 97.1% (91.4−100.0) | 34 |
| 3+m* | 30.8 % (5.7−55.9) | 13 | 92.3 % (77.8−100.0) | 13 |
N: number of specimens for each time period.
*
Significant difference was determined as p < 0.05 by Chi-square test for association.