| ALT | Alanine aminotransferase |
| ANOVA | Analysis of variance |
| AST | Aspartate aminotransferase |
| CI | Confidence interval |
| COPD | Chronic obstructive pulmonary disease |
| COVID-19 | Coronavirus disease 2019 |
| CPAP | Continuous positive airway pressure |
| CRP | C-reactive protein |
| Ct | Cycle threshold |
| ETI | Endotracheal intubation |
| GCS | Glasgow coma scale |
| EBV | Epstein–Barr virus |
| FiO2 | Fraction of inspired oxygen |
| GGO | Ground glass opacities |
| HHV | Human herpesviruses |
| HCMV | Human cytomegalovirus |
| HFNC | High flow nasal cannula |
| HIV | Human immunodeficiency virus |
| HSV | Herpes simplex virus |
| ICU | Intensive care unit |
| IL | Interleukin |
| LDH | Lactate dehydrogenase |
| NIV | Non-invasive ventilation |
| NK | Natural killer |
| NKG2A | Natural killer group 2 member A |
| OR | Odds ratio |
| PaO2 | Arterial partial pressure of oxygen |
| PCR | Polymerase chain reaction |
| Q-Q | Quantile–quantile |
| RT | Real-time reverse transcriptase |
| SARS-CoV-2 | Severe acute respiratory syndrome coronavirus 2 |
| SOFA | Sequential organ failure assessment |
| VZV | Varicella-zoster virus |
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