Overview
- Influenza activity across the WHO European Region began about four weeks earlier than in recent seasons.
- At least 27 of 38 reporting countries are at high or very high activity, and Ireland, Kyrgyzstan, Montenegro, Serbia, Slovenia and the United Kingdom report over 50% positivity among patients tested for influenza‑like illness.
- The A(H3N2) subclade K now accounts for up to 90% of confirmed cases, with no evidence it causes more severe disease.
- Early United Kingdom data indicate the current seasonal vaccine lowers the risk of severe outcomes from A(H3N2) even when infections occur.
- WHO advises vaccination for high‑risk groups and recommends hand hygiene, staying home when unwell and wearing a mask with respiratory symptoms, noting children drive spread and adults 65+ comprise most severe hospitalizations.