Table 1.

Disease severity classification criteria

Mild disease	With symptoms but without signs suggestive of pneumonia, and SpO2 > 93% on room air, and without chest imaging findings suggestive of viral pneumonia
Moderate disease	With clinical signs of pneumonia but without severe pneumonia (SpO2 ≥ 90% on room air, respiratory rate < 30 breaths/min, without severe respiratory distress) or with chest imaging findings suggestive of viral pneumonia
Severe disease	With severe pneumonia (SpO2 < 90% on room air, respiratory rate > 30 breaths/min, or severe respiratory distress) but not necessitating Intensive Care
Critical disease	Necessitating intensive-care unit referral

SpO₂ Oxygen saturation