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The trivalent mRNA hemagglutinin (TIV mRNA-HA) influenza vaccine is an investigational messenger RNA-based vaccine designed to protect against three strains of the influenza virus by encoding the viral hemagglutinin (HA) antigen. The mechanism of action involves delivery of synthetic nucleoside-modified or unmodified mRNA encoding HA antigens via lipid nanoparticles or polymeric nanoparticles, leading to in vivo expression of HA proteins and induction of a protective immune response. This approach aims to elicit robust neutralizing antibody titers and cellular immunity against multiple influenza subtypes. The primary indication is prevention of seasonal or pandemic influenza infection in adults[1][2][5]. Developers include major pharmaceutical companies with expertise in RNA technology.
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