Maidenhead, United Kingdom – September 16, 2026 -- CSL Seqirus has published pivotal Phase 3 results for its MF59-adjuvanted, cell-based, higher-dose quadrivalent influenza vaccine (aQIVc) in The Lancet Infectious Diseases, reporting superiority over an adjuvanted egg-based comparator across all four influenza strains and age groups tested in a 7,699-participant trial.