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Early UK Flu Surge Driven by Drifted H3N2, With Strong Vaccine Protection in Children

Fresh UKHSA data indicates the 2025–26 jab is substantially reducing hospital visits, especially in two to 17 year‑olds.

Overview

  • UKHSA estimates the vaccine is 70–75% effective at preventing hospital attendance in children aged 2–17 and about 30–40% effective in adults.
  • RCPCH urges parents to vaccinate as previously healthy children can become seriously ill from flu and, in rare cases, die.
  • For the first time, children aged two to three can receive the nasal spray at participating community pharmacies, with a porcine‑free injectable alternative available.
  • Clinicians report the season has started about a month early, with hospitals seeing rising respiratory admissions, including at Royal Stoke University Hospital.
  • A drifted influenza A(H3N2) subclade (K) is dominating cases and may evade some prior immunity, and officials warn uptake gaps, including in care homes, leave many at risk.