Table 1.

Clinical manifestations of the COVID-19 pandemic classified by the severity according to the Chinese National Health Commission.

Mild Disease	Severe Disease	Critical Disease
Fever; Respiratory symptoms; No pneumonia or mild pneumonia	Dyspnea; Respiratory frequency higher than 30/min; Blood oxygen saturation lower than 93% at rest state; PaO2/FiO2 ratio lower than 300 mmHg; Lung infiltrates higher than 50% within 24 to 48 h	Respiratory failure needs mechanical ventilation; Sepsis, septic shock; Multiple organ dysfunction or failure. Patients need Intensive Unit Care monitoring and treatment.