| ACE2 | angiotensin converting enzyme 2 |
| APCs | antigen-presenting cells |
| BCR | B cell receptor |
| BALF | bronchoalveolar lavage fluid |
| COVID-19 | coronavirus disease 19 |
| mAbs | monoclonal antibodies |
| NAbs | neutralising antibodies |
| NTD | N-terminal domain |
| RBD | Receptor binding domain |
| TH1 | T helper 1 |
| TH2 | T helper 2 |
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