Materials and Methods
We conducted an observational study analyzing LUS patterns in consecutively admitted children with COVID-19 infection in a tertiary level pediatric hospital in Rome from the 27 of March 2020 to June the 1st 2020. All patients with swab-confirmed COVID-19 infection who underwent LUS within 6 hours from admission (T0) and after 96 hours (T1) were included. Patients aged 18 years or more, those who did not underwent both LUS or with comorbidity were excluded. The severity of the disease was classified using the classification of Parri et al, based on the adapted classification of Dong et al.15,16 The use of LUS in the evaluation of children with respiratory infection has been approved by the ethics committees of our institution. Informed consent was obtained from each parent/guardian.