| RT-PCR | Reverse transcription of polymerase chain reaction |
| CCI | Charlson Comorbidity Index |
| COPD | Chronic obstructive pulmonary disease |
| pO2 | Partial pressure of arterial oxygen |
| SatO2 | Peripheral oxygen saturation |
| PCR | C-reactive protein |
| PCT | Procalcitonin |
| ACE | Angiotensin-converting enzyme |
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