Definition of mild:
• Symptomatic (any acute COVID-19 related symptoms)
• AND respiratory rate <24/min
• WITHOUT pneumonia or hypoxia
Definition of moderate illness:
• Pneumonia (clinical or radiological) OR hypoxia (SpO2 <94% in adults with no underlying lung disease) • AND respiratory rate ≤30/min • AND SpO2 ≥90% on room air
Definition of Severe illness
Pneumonia with ANY ONE of the following:
• severe respiratory distress or respiratory rate >30/min
• SpO2 <90% on room air
• NO invasive or non-invasive respiratory support needed
Definition of critical:
• Requirement for high-level respiratory support: noninvasive ventilation, high-flow oxygen (≥20 litre per minute) or invasive mechanical ventilation
• OR acute respiratory distress syndrome (PaO2/FiO2 ratio of <300)
• OR sepsis
• OR shock