Chest radiograph findings monitoring with time course of COVID-19 pediatrics patients.

Screening x-ray at the first diagnosis had high rates of abnormality detection regardless of symptom. For patients with normal first x-ray, abnormalities could be detected on later films, mostly in phase 1 and 2. So, even with the fear of unnecessary exposure to radiation in kids, x-ray should be performed at the first diagnosis regardless of symptom. Appropriate timing to follow-up x-ray was phase2, at day 5-8 of disease.