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| Symptoms | Points |
| Petechial Rash | 5 |
| Alveolar infiltrates on chest radiograph | 4 |
| Hypoxemia (<70 mmHg) | 3 |
| Confusion | 1 |
| Fever > 38 °C | 1 |
| Heat rate >120 beats per minute | 1 |
| Respiratory rate >30 breaths per minute | 1 |
