The changing virology and trends in resource utilization for bronchiolitis since COVID-19.

Bronchiolitis ED visits due to RSV dramatically reduced during the first year of the COVID-19 pandemic in 2020, with over 80% reduction in bronchiolitis visits from 2018 to 2019. While all ED visits fell in 2020, the proportion of visits due to bronchiolitis also decreased. There was an increase in lower value care during the rhinovirus dominant, low census period. As restrictions lifted in 2021, there was a large resurgence of RSV in the atypical summer months with a return of previous rates of resource utilization.