Key Points

Acute respiratory infections (ARI)

• 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.