Policy and strategy The national influenza immunisation programme 2026 to 2027 (WHC/2026/010) Letter to health professionals about the vaccinations with several changes and detailed guidance. Part of: Health circulars: 2024 to 2027, Vaccination and immunisation Welsh Health Circulars (WHC), Infections (Sub-topic), Respiratory disease (Sub-topic) and Vaccination (Sub-topic) First published: 1 July 2026 Last updated: 1 July 2026 Documents The national influenza immunisation programme 2026 to 2027 (WHC/2026/010) The national influenza immunisation programme 2026 to 2027 (WHC/2026/010) , HTML HTML Related Vaccination (Sub-topic)Eligible groups in the 2026 to 2027 flu immunisation programme