GSK to advance mRNA flu vaccine into Phase III

2 September 2026

UK pharma major GSK presented positive Phase II data for its investigational mRNA seasonal influenza vaccine at the OPTIONS XIII Conference for the Control of Influenza on Monday, and said it intends to begin a Phase III efficacy trial this month.

This will be the first Phase III trial of an mRNA flu vaccine designed to target both hemagglutinin (HA) and neuraminidase (NA), the two primary surface proteins that let the flu virus bind to cells and spread.

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