The regions affected by a bronchiolitis pre-epidemic are Hauts-de-France, Auvergne-Rhône-Alpes, Grand Est, Nouvelle-Aquitaine, Provence-Alpes-Côte d’Azur and Centre-Val de Loire. Corsica, Occitanie, Burgundy-Franche-Comté and the overseas departments and regions are still at their base level.
“Syndromic indicators linked to bronchiolitis increased in town and in hospital, to levels close to those observed the previous season at the same period,” notes SPF.
The share of medical activity linked to bronchiolitis during the past week, from November 17 to 23, was, for children under one year old, 9.1% among SOS Médecins procedures (+0.6 points compared to the previous week), 18.5% among visits to the emergency room (+4.5 points) and 32.3% among hospitalizations after visits to the emergency room (+7.8 points).
This corresponded to a total of 259 SOS Médecins acts for bronchiolitis in children under one year old, as well as 2,364 visits to the emergency room and 765 hospitalizations.
The intensity of bronchiolitis remained at a low level in community medicine and went from the basic level to a low level in hospital settings.
Flu: three regions in pre-epidemic
Concerning the flu, activity increased last week in all age groups in France, “indicating the start of the circulation of influenza viruses in the general population and particularly among children”, notes SPF.
However, the indicators for use of care in town and in hospital remained at their basic level in the majority of French regions, except in Ile-de-France, Normandy and New Aquitaine, now in the pre-epidemic. Activity was at baseline in overseas regions except Mayotte, which rose to epidemic level last week.
SPF observes that type A viruses were very much in the majority, with co-circulation of “subtypes A(H1N1)pdm09 and A(H3N2)”.
As for the Covid-19 indicators, they decreased both in the city and in the hospital and were at low levels.
(SPF, bulletin on acute respiratory infections (flu, bronchiolitis, Covid-19), November 26, 2025)
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