Table 2.
Epidemiological characteristics of antibody-positive cases
| Subject ID | Occupation/risk category | IgG 1 (Abbott) 1st assay/2nd assaya |
Total Ab (Roche) 1st assay/2nd assaya | Total Ab/IgG (OCD) | RT-PCR nasopharyngeal swab | Symptoms of influenza-like illness | Exposure to COVID-19 patient | Final Interpretation |
|---|---|---|---|---|---|---|---|---|
| CAb 138 | Emergency technician/high risk | 2.41/2.85 | 0.08/0.09 | 0.09/0.00 | Negative | NO | NO | False positive |
| CAb 362 | Anaesthetist, doctor/high risk | 2.66/2.51 | 0.07/0.08 | 0.03/0.00 | Negative | NO | NO | False positive |
| CAb 609 | Nurse, isolation ward/high risk | 0.15/0.18 | 1.56/1.48 | 0.03/0.00 | Negative | NO | NO | False positive |
| Positive control | COVID-19 patient | 7.62/ND | 52.23/ND | ND | Positive | Yes | Yes | True positive |
OCD, ortho-clinical diagnostics; ND, not done.
Abbott cut-off S/CO-value = 1.4; Roche cut-off S/CO-value = 1; OCD cut-off S/CO-value = 1.
a
Second assay done on sample collected 10 days after first sample.