Key Points

• Indicators pointing to a rapid and earlier onset of bronchiolitis virus circulation compared to previous years

• Transition to the epidemic phase in Grand-Est and Île-de-France

• Transition to the pre-epidemic phase in Auvergne-Rhône-Alpes, Bourgogne-Franche-Comté, Brittany, Centre-Val-de-Loire, Normandy, Nouvelle-Aquitaine, Occitanie, Pays-de-la-Loire, Provence-Alpes-Côte d’Azur, and French Guiana