Fig. 1. Relation between symptom presence and entering the isolation units in children with COVID-19. (A) BMC and (B) the Nowon RTC. Of the 53 children, 12 (23%) were asymptomatic until the end of isolation. The median time from symptom onset to facility isolation was 1 day at BMC and 3 days at RTC. The symptomatic children's total number of days with illness was 144 days and approximately 76% (109 days) were experienced before entering the isolation unit (Dark colors, the symptomatic period; light colors, the asymptomatic period; and red dots, the date of diagnosis).

COVID-19 = coronavirus disease 2019, BMC = Seoul Metropolitan Government-Seoul National University Boramae Medical Center, RTC = residential treatment center.