Key Points

The 2019–20 bronchiolitis epidemic in mainland France began in week 50 of 2019, peaked in week 52 of 2019, and ended in week 11 of 2019. It lasted 14 weeks, comparable to the previous season.

Its intensity was slightly lower at the peak than during the previous season. The proportion of hospitalizations for bronchiolitis was comparable to recent seasons.

In the French West Indies, the epidemic that began in week 43/2019 ended in week 04/2020. In Réunion, the epidemic that began in week 08/2020 ended in week 12/2020.