| MBA | Microsphere-based antibody assay |
| EIA | Enzyme immunoassay |
| SARS-CoV | Severe acute respiratory syndrome coronavirus |
| SARS-CoV-2 | Severe acute respiratory syndrome coronavirus 2 |
| NP | SARS-CoV-2 nucleoprotein |
| RBD | Spike protein receptor binding domain |
| IgG | Immunoglobulin G |
| FBS | Fetal bovine serum |
| PBS | Phosphate-buffered saline |
| S/CO | Signal-to-cutoff |
| CI | Confidence interval |
| MFI | Mean fluorescent intensity |
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