Hospitalisation trends from 2019 to 2023 illustrate the persistent resurgence of bronchiolitis in Italy

We conducted a descriptive analysis based on the total number of patients per year and per virus. Patient data were aggregated into monthly counts, and the results were presented in graphic form by month. Given the seasonal nature of RSV and influenza, particular attention was paid to the winter periods, which were defined as from October 1 to March 31 of the following year. The impact of public health interventions during the COVID-19 pandemic led to a significant reduction in the incidence of illness due to major respiratory viruses in the second half of 2020, accompanied by a significant epidemiologic shift that began in 2021 and persisted through the 2022-2023 respiratory season.