| Abbreviation | Definition |
| AU | arbitrary units |
| BAU | binding antibody units |
| CMIA | chemiluminescence microparticle assay |
| ELISA | enzyme-linked immunosorbent assay |
| hACE2 | human angiotensin-converting enzyme 2 |
| RBD | receptor-binding domain |
| sVNT | surrogate virus neutralization test |
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