Graphical Abstract

Public Summary

● Adolescents and young adults are more involved in frequent social-activity, overseas studying, and international working or tourism, which make them to be susceptible to worldwide spread of the coronavirus disease 2019 (COVID-19).

● Adolescent and younger patients of COVID-19 had a median incubation period of 8 days and 50% of their family contacts could develop illness within 1.4 days after exposure.

● Three asymptomatic patients have infected their family contacts.

● Few adolescent and young adult patients showed severe clinical signs and symptoms such as bacterial pneumonia changes by Chest CT findings, fever, and shortness of breath.

● Most adolescent and young adult patients had better prognosis outcomes after treatment.

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