3.1 Clinical characteristics
The demographics and clinical characteristics of all the patients were summarized in Table 1. Male (69, 61%) and school-age children (older than 6 years, 56, 49%) were more susceptible to COVID-19. In most cases, the duration from symptom onset to discharge was less than 21 days (87, 76%), with an average hospital stay of 13 days. Fever (62, 54%) and cough (61, 54%) were the most common symptoms. Concurrent infection were found in 34 (30%) cases, with mycoplasma (29, 25%) being the most common concurrent infectious pathogen.