| Abbreviation | Definition |
| BAL | Bronchoalveolar Lavage |
| BAS | Bronchoaspirate |
| CAP | Community-Acquired Pneumonia |
| CAP-MDR | Community-Acquired Pneumonia at Risk for Multidrug-Resistant Pathogens |
| CI | Confidence Interval |
| CRF | Case Report Form |
| ED | Emergency Department |
| ETA | Endotracheal Aspirate |
| FiO2 | Fraction of Inspired Oxygen |
| HAP | Hospital-Acquired Pneumonia |
| HDU | High Dependency Unit |
| HFNC | High-Flow Nasal Cannula |
| HR | Hazard Ratio |
| ICU | Intensive Care Unit |
| MDR | Multidrug-Resistant |
| MSP | Molecular Syndromic Panel |
| NIV | Non-Invasive Ventilation |
| OR | Odds Ratio |
| PCR | Polymerase Chain Reaction |
| PSI | Pneumonia Severity Index |
| PSM | Propensity Score Matching |
| SD | Standard Deviation |
| SOFA | Sequential Organ Failure Assessment |
| VAP | Ventilator-Associated Pneumonia |
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