| BAU | Binding antibody units |
| BCG | Bacillus Calmette–Guérin |
| BMI | Body Mass Index |
| COVID-19 | Coronavirus disease 2019 |
| e-CRF | electronic Case Report Form |
| ELISA | Enzyme-linked immunosorbent assay |
| IgG | Immunoglobulin G |
| PCR | Polymerase chain reaction |
| RU | Relative units |
| SARS-CoV-2 | Severe acute respiratory syndrome coronavirus 2 |
| TB | Tuberculosis |
| Th1 | T helper type 1 |
| Th17 | T helper type 17 |
| WHO | World Health Organisation |
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