Table 1.

The classification of COVID-19 severity (adapted from the WHO4)

Non-Severe	Severe	Critical
Patients without characteristics of severe and critical disease.	Patients characterized by signs of Pneumonia (fever, cough, dyspnea) with one of the following: • Respiratory rate >30. • Severe respiratory distress. • SpO2 < 90% on room air (RA.)	Patients characterized by one of the following: • ARDS. • Sepsis. • Septic shock. • Organ failure (ex, cardiac injury or acute kidney injury). • Need for mechanical ventilation (invasive or non-invasive) or vasopressor therapy.

ARDS- stands for acute respiratory distress syndrome. SpO₂- Peripheral oxygen saturation, an estimation of the oxygen saturation level.