Acute respiratory infections (influenza, bronchiolitis, COVID-19). Review of the 2025–2026 season.

Published on 15 April 2026 Updated on 17 April 2026

thematic dossier

13 June 2024

Acute respiratory infections

Les infections respiratoires aiguës sont dues à différents virus respiratoires tels que le SARS-CoV-2 (à l’origine de la COVID-19), les virus grippaux, le virus respiratoire syncytial (VRS)...

Key Points

Acute respiratory infections

Activity concentrated between November 2025 and February 2026, with a moderate peak in the city but a high peak in hospitals, occurring in late 2025 and driven primarily by influenza.

Influenza

An epidemic driven exclusively by type A viruses occurring between December 2025 and mid-February 2026 (duration: 10 weeks), with low to moderate intensity in the community but high intensity in hospitals, and with a significant impact on mortality observed in early 2026.

Bronchiolitis

An epidemic occurring at the usual time of year and of short duration (8 weeks) between November and December 2025, of low intensity and comparable to the 2024–2025 epidemic.

COVID-19

Low demand for medical care during the 2025–2026 season despite continued circulation of SARS-CoV-2 in the general population.

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Flu

thematic dossier

14 October 2026

The flu is a contagious viral respiratory infection that causes seasonal outbreaks every winter. The flu vaccine is the most effective way to protect yourself.

Bronchiolitis

thematic dossier

15 April 2026

Acute bronchiolitis is a viral respiratory illness that primarily affects children under the age of 2 during seasonal winter outbreaks.

COVID-19

thematic dossier

21 October 2026

COVID-19 is a contagious viral infection. By practicing preventive measures and getting vaccinated, you can protect yourself from infection and its complications while limiting the spread of the...