Method
Prospective cohort with nested case-control study of all children tested
by PCR for SARS-CoV-2 by nasopharyngeal/oropharyngeal sampling between
March and October 2020. Children were identified prospectively via
laboratory notification with age and sex-matching of SARS-CoV-2[+]
to SARS-CoV-2[-] (1:2). Clinical data were extracted from the
electronic medical record.