Table 1. Technical characteristics of the anti-SARS-CoV-2 antibodies immunoassays used in this study.
AU, arbitrary units; BAU, binding antibody units; CLIA, ChemiLuminescent ImmunoAssay; Ig, ELISA; enzyme linked immunoassay; Ig, Immunoglobulin; RBD, Receptor Binding Domain; S1, Spike protein S1 subunit
| Immunoassay | Company | Analyzer | Principle | Antibodies | Target | Cut-off |
|---|---|---|---|---|---|---|
| LIAISON SARS-CoV-2 TrimericS IgG | DiaSorin | LIAISON XL | CLIA | IgG | Spike protein trimer | <33.8 BAU/mL |
| ACCESS SARS-CoV-2 IgG II | Beckman Coulter | Access 2 | CLIA | IgG | RBD | <10 AU/mL |
| Anti-SARS-CoV-2 ELISA IgA | Euroimmun | - | Manual ELISA | IgA | S1 | <1.1 ratio |