Table 1 The WHO clinical classification of the COVID-19 [3]
Mild case | Moderate | Severe | Critically severe |
|---|---|---|---|
Mild clinical manifestations, none imaging performance | Fever, dyspnea, pneumonia performance on X-ray or CT | Meet any of the following: Respiratory distress, RR ≥ 30/min Oxygen saturation ≤ 93% PaO2/FiO2 ≤ 300 mmHg | Respiratory failure needs mechanical ventilation Shock Combination with other organ failure, patients need intensive care monitoring and treatment |