Key Points

• A brief 6-week influenza epidemic in 2023–2024 (weeks S03–2024 through S08–2024).

• Epidemic peak in week S04-2024 or S05-2024, depending on the data source.

• Predominant circulation of A(H1N1)pdm09 viruses.

• Moderate scope and intensity in community and hospital settings.

• 70 influenza cases admitted to intensive care between week S42-2023 and week S14-2024 were reported, including 50 during the epidemic period.

  • The median age of patients in intensive care was 64 years.

  • 89% of patients had at least one comorbidity.

  • The case fatality rate was 10%.

• Vaccination coverage across all at-risk groups (52.8%) was down 6 percentage points compared to the 2022–2023 season (59.1%), falling short of the 75% target.