5 Clinical Classifications

5.1 Mild Cases

The clinical symptoms are mild and no pneumonia manifestation can be found in imaging.

5.2 Ordinary Cases

Patients have symptoms like fever and respiratory tract symptoms, etc.and pneumonia manifestation can be seen in imaging.

5.3 Severe Cases

Meeting any of the following:

5.3.1 Respiratory distress, RR ≥30 breaths/min;

5.3.2 The oxygen saturation is less than 93% at a rest state;

5.3.3 Arterial partial pressure of oxygen(PaO2)/ oxygen concentration(FiO2)≤300 mmHg(1 mmHg=0.133 kPa).

For high altitude areas(above 1 kilometer), PaO2/FiO2 values should be adjusted based on equation of PaO2/FiO2 × [Atmospheric Pressure(mmHg)/760].

Patients with >50% lesions progression within 24 to 48 hours in pulmonary imaging should be treated as severe cases.

5.4 Critical Cases

Meeting any of the following:

5.4.1 Respiratory failure occurs and mechanical ventilation is required;

5.4.2 Shock occurs;

5.4. 3 Complicated with other organ failure that requires monitoring and treatment in ICU.