The median age of the study population was 5·0 years (IQR 0·5–12·0), ranging from 3 days to 18 years. Age was non-normally distributed (W=0·8710; p<0·0001), with 170 (29%) participants younger than 12 months. The sex ratio was 1·15 males to every female. The most common source of infection was a parent, considered the index case in 324 (56%) individuals; for 24 (4%) individuals, the most probable index case was a sibling. In the remaining 234 (40%) individuals, the index case was a person outside of the immediate family or unknown. 363 (62%) individuals were admitted to hospital and 48 (8%) required admission to an ICU for additional support, corresponding to 13% of those admitted to hospital. Explored factors associated with need for intensive care unit (ICU) admission and initiation of drug treatment for COVID-19 using univariable analysis, and applied multivariable logistic regression with backwards stepwise analysis to further explore those factors significantly associated with ICU admission.