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A recent study published in JAMA Network Open described the epidemiological characteristics of respiratory syncytial virus (RSV) infection in Ontario, Canada, after the onset of the COVID-19 pandemic. It is the latest in a series of studies that suggest that virus circulation dynamics and hospitalizations have changed over time. These are crucial pieces of information for managing the seasonal epidemic.

The Canadian study compared hospitalization rates and characteristics of children aged < 5 years who were admitted to the hospital for RSV infection during three pre-pandemic seasons (2017-2020) and two "post-pandemic" seasons (2021-2023).

Compared with the pre-pandemic period, the 2021-2022 RSV season peaked a little earlier (early December instead of mid-December) but had comparable hospitalization rates. The 2022-2023 season, on the other hand, peaked a month earlier with a more than doubled hospitalization rate.

Hospitalizations increased from about 2000 to 4977. In 2022, hospitalizations also occurred in spring and summer. In 2022-2023, more hospitalizations than expected were observed, especially in the 24-59–month-old group. Head over to Medscape to read the full story.