There are four clinical types according to Chinese guideline on COVIF-19 pneumonia:
- Mild type: Clinical symptoms are mild and no signs of pneumonia are seen on imaging
- Common type: Fever, respiratory infections, and other symptoms; pneumonia can be seen on imaging.
- Severe type: Any of the following conditions:
- Respiratory distress, RR > 30 times/min
- Resting-state oxygen saturation < 93%
- Arterial oxygen partial pressure (PaO2)/oxygen concentration (FiO2) < 300 mmHg
- Critical type: Any of the following conditions:
- Respiratory failure occurs and requires mechanical ventilation
- Patient suffers from shock
- Combined with other organ failure requiring ICU monitoring and treatment