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Clinical findings according to the COVID-19 respiratory illness severity groups.
| COVID-19 respiratory illness severity | Clinical features |
| Mild illness | Mild fever, cough (dry), sore throat, malaise, headache, muscle pain, nasal congestion |
| Moderate pneumonia | Cough and shortness of breath |
| Severe pneumonia/acute respiratory distress syndrome | Fever is associated with severe dyspnea, respiratory distress, tachypnea, and hypoxia |
