Search: date:2028-06-09

Health09/20/2026@HealthDesk

MRNA Seasonal Flu Vaccine's Phase 3 Trial in Influenza, Human Reads Out

GSK79 New Oxford Street, London, Greater London, United Kingdom

Starts 06/09/2028ESTIMATED50% CONFIDENCE

ClinicalTrials.gov^[1] lists 2028-06-09 as the estimated primary completion date; a sponsor's estimate, and trials of this size routinely slip.

GSK's phase 3 trial of MRNA Seasonal Flu Vaccine in influenza, human reaches primary completion, the point at which the last participant's primary outcome is measured. The trial enrolled 54,000 participants. This study will compare an investigational mRNA flu vaccine with a licensed flu vaccine in adults 65 years of age and older. Participants will receive one injection and will be followed during the flu season. The study will measure prevention of laboratory-confirmed flu illness, side effects, and immune responses.

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MRNA Seasonal Flu Vaccine's Phase 3 Trial in Influenza, Human Reads Out