Overview
- UKHSA says a drifted A(H3N2) subclade known as K now dominates cases in England, with hospital admissions rising earlier than usual to 3.8 per 100,000 from 2.4 the previous week.
- Early effectiveness estimates show the 2025/26 vaccine prevents 70–75% of hospital attendances in children aged 2–17 and 30–40% in adults, according to UKHSA.
- The NHS has issued a ‘flu jab SOS’ as uptake lags in vulnerable groups, with reports that about two in five care home residents remain unvaccinated.
- Paediatric leaders at the RCPCH warn H3N2 can be life‑threatening in rare cases and urge parents to ensure children receive the nasal spray vaccine.
- Researchers report the circulating H3N2 acquired multiple mutations over the summer; Australia recorded its worst flu season on record and Japan saw epidemic outbreaks and school closures, trends UK officials are watching closely.