Impact of COVID-19 outbreak in acute bronchiolitis: Lesson from a tertiary Italian Emergency Department.

AIM: To assess the impact of the coronavirus disease 2019 (COVID-19) outbreak on pediatric emergency department (ED) visits for acute bronchiolitis during the epidemic season. METHODS: A retrospective analytical cross-sectional study was performed in our hospital, analyzing medical charts of all children under 2 years of age with a diagnosis of acute bronchiolitis admitted to our ED in the last years. Demographics and clinical data of patients affected with acute bronchiolitis during the 2020-2021 season-COVID-19 outbreak-were compared to those of the 5 previous years. RESULTS: We observed an average drop of 84% of the rate of acute bronchiolitis managed by pediatricians in ED in 2020-2021 compared with bronchiolitis seasons of 5 previous years. We also reported, during the COVID-19 outbreak, a higher number of children affected by acute bronchiolitis referred to ED as Emergency Consultations who required hospitalization. Regarding etiological agents, no differences in respiratory virus circulation, especially RSV, were observed in the two groups. The multivariate analysis showed no correlation between the diagnosis of RSV bronchiolitis and COVID-19 period or prematurity; lower age was associated with an increased likelihood of exhibiting RSV bronchiolitis (odds ratio 0.9; 95% confidence interval 0.86-0.95 p < .01). CONCLUSION: Our data emphasize the reduction in the rate of admission to pediatric ED for acute bronchiolitis during the COVID-19 outbreak, regardless of changes in circulating respiratory viruses. Therefore we want to highlight the importance of nonpharmacological preventive hygiene measures that should be maintained even at the end of the COVID-19 outbreak.