WHO Updates Flu Vaccine Strains for 2026-27 Northern Hemisphere
WHO recommends the 2026–27 northern hemisphere flu vaccines with updated strains: egg-based vaccines should contain A/Missouri/11/2025 (H1N1)pdm09-like, A/Darwin/1454/2025 (H3N2)-like, and B/Tokyo/EIS13-175/2025 (B/Victoria lineage)-like; cell culture-, recombinant protein-, or nucleic acid-based vaccines should include A/Missouri/11/2025 (H1N1)pdm09-like, A/Darwin/1415/2025 (H3N2)-like, and B/Pennsylvania/14/2025 (B/Victoria lineage)-like. The review also addresses animal (zoonotic) influenza threats, notes 25 human infections since Sept 2025 with no human-to-human transmission, and calls for developing a new CVV for A(H9N2).