A very low prevalence of SARS‐CoV‐2 infection but a high prevalence of other respiratory virus infections in children admitted to paediatric emergency departments

AIM: To investigate the prevalence of infections by severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) and other respiratory viruses among children admitted to paediatric emergency departments (PEDs). METHODS: From April to July 2020, a prospective, multicentre cohort study was conducted in the PEDs of eight French university hospitals. Regardless of the reason for admission, a nasopharyngeal swab sample from each child was screened using reverse transcription polymerase chain reaction tests for SARS‐CoV‐2 and other respiratory viruses. We determined the prevalence of SARS‐CoV‐2 and other respiratory viruses and identified risk factors associated with a positive test. RESULTS: Of the 924 included children (median [interquartile range] age: 4 years [1–9]; boys: 55%), 908 (98.3%) were tested for SARS‐CoV‐2. Only three samples were positive (0.3%; 95% confidence interval: 0.1–1) and none of these children had symptoms of coronavirus disease 2019. Of the 836 samples (90%) tested for other viruses, 129 (15.4%) were positive (primarily rhinovirus). Respiratory viruses were significantly more common in young children and in children with respiratory tract symptoms and fever. CONCLUSION: The prevalence of SARS‐CoV‐2 among children admitted to emergency departments was low. In contrast, and despite social distancing and other protective measures, the prevalence of other respiratory viruses detection was high.