Key Points

• Flu outbreak with an early onset in early December 2025 and a relatively long duration (10 weeks)
• Epidemic peak observed in late December 2025/early January 2026 (between S52-2025 and S02-2026, depending on the source)
• Circulation of almost exclusively type A influenza viruses: A(H1N1)pdm09 and A(H3N2)
  Outbreak characterized by moderate to high intensity in community-based care and very high intensity in hospitals
• High-intensity epidemic, but less severe than the 2024–2025 epidemic
• Mortality: Alert thresholds exceeded between weeks S01 and S04-2026, affecting the elderly
• Vaccination coverage across all at-risk groups (56.2%) increased compared to the 2024–2025 season (52.4%), but remained below the 75% target