Table 2.

Severity of Covid-19 infection in children. This classification has been formulated on the basis of Chinese data and experience to standardize prevention and management of 2019-nCoV infections in children²².

Severity of infection	Clinical and radiological features
Asymptomatic	No clinical symptoms and signs, normal chest imaging, with positive 2019-nCoV nucleic acid test.
Mild	Symptoms of acute upper respiratory tract infection, including fever, fatigue, myalgia, cough, sore throat, runny nose and sneezing. Some cases may have nausea, vomiting, abdominal pain and diarrhoea.
Moderate	Pneumonia with fever and cough (mostly dry cough, followed by productive cough) without hypoxemia. Some cases may have no clinical signs and symptoms, but chest computed tomography shows typical lung lesions.
Severe	The disease progresses with dyspnoea and central cyanosis. Oxygen saturation is <92%.
Critical	Children and particularly adolescents and young adults can progress to respiratory failure and shock or other organs failure (encephalopathy, acute kidney injury, heart failure, coagulation dysfunction) .