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Rates of “false” positivity of SARS-CoV-2 IgM and IgG antibodies in 200 healthy blood donors.
| n = 200 | IgM | IgG | IgM or IgG |
|---|---|---|---|
| 200 (100%) | −199 (99.5%) | −198 (99%) | −197 (98.5%) |
| ±0 (0%) | ±0 (0%) | ±0 (0%) | |
| +1 (0.5%) | +2 (1%) | +3 (1.5%) |
- Negative (OD ≤ negative cutoff).
±Borderline (OD > negative cutoff but < positive cutoff).
+ Positive (OD ≥ positive cutoff).
