Severity	Mild	Moderate	Severe	Critical
Characteristics	-Normal respiratory rate for age. -SpO2 ≥ 96% in room air.	- Tachypnea for age - SpO2: 94–95% in room air. - Awake, can eat and drink - Interstitial lesions/the ground glass on chest X-rays.	- Severe pneumonia - SpO2: 90 - < 94% in room air. - Tired of breastfeeding, eating poorly - Lung lesions ≥50% on chest X-rays	- Mechanical ventilation - Cyanosis - SpO2 < 90% in room air. - Shock - Multi-organ failure. - Cytokine storm.