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ROC analysis of RBD or Spike protein after the initial screening of pre‐COVID‐19 serum and sera from healthcare workers who were SARS‐COV‐2 PCR‐positive
| RBD | Spike | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Cut off | Sensitivity % | CI (%) | Specificity % | CI (%) | Cut off | Sensitivity % | CI (%) | Specificity % | CI (%) |
| 0.4171 | 99.00 | 94.55‐ 99.97 | 100.00 | 82.35‐ 100.00 | 0.4816 | 98.00 | 92.96‐ 99.76 | 94.74 | 73.97‐ 99.87 |
| 0.5532 | 100.00 | 96.38‐ 100.00 | 100.00 | 82.35‐ 100.00 | 0.6302 | 99.00 | 99.55‐ 99.97 | 94.74 | 73.97‐ 99.87 |
