Asymptomatic | Without any symptoms, confirmed by laboratory tests. |
Mild | Respiratory infection of the upper tract: fever, cough, fatigue, anorexia, myalgia, sore throat, rhinorrhoea and headache; rarely with nausea, vomiting and diarrhoea. |
Moderate | Pneumonia with non-severe signs of respiratory distress: tachypnoea <2 months: ≥60 cpm; 2–11 months: ≥50 cpm; 1–5 years: ≥40 cpm; >5 years: >30 cpm, moderate recession; SpO2 ≥93%. |
Severe | Pneumonia with severe signs of respiratory distress: central cyanosis or SpO2 <93%, severe tachypnoea (70 cpm; >12 months: >50 cpm), severe recession, grunting and nasal flaring; severe anorexia, lethargy/diminished level of consciousness and convulsions. |
Critical | ARDS, sepsis and septic shock. |
ARDS, acute respiratory distress syndrome; cpm, cycles per minute; SpO2, peripheral capillary oxygen saturation.