| BAL | Bronchoalveolar lavage |
| Ct | Cycle threshold |
| dPCR | Digital polymerase chain reaction |
| ddPCR | Droplet digital polymerase chain reaction |
| qPCR | Quantitative polymerase chain reaction |
| ROC | Receiver operating characteristic |
| RT-PCR | Reverse transcription polymerase chain reaction |
| RSV | Respiratory syncytial virus |
| SARS-CoV-2 | Severe acute respiratory syndrome coronavirus 2 |
| WHO | World Health Organization |
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