inactivated trivalent split-virus influenza vaccine

The **inactivated trivalent split-virus influenza vaccine** is an injectable seasonal flu vaccine containing three components: two inactivated influenza A virus subtypes (H1N1 and H3N2) and one B/Victoria lineage virus. The "split-virus" formulation means the viruses are chemically disrupted to reduce reactogenicity while retaining immunogenic viral proteins. This type of flu shot does not contain live virus and cannot cause the flu. It works by inducing an immune response against hemagglutinin antigens from each included strain, providing protection against circulating seasonal strains that match the selected components[1][2][6]. The primary indication is prevention of seasonal influenza infection for individuals aged 6 months and older[2]. For the 2024–2025 season, all U.S.-approved injectable flu vaccines will be this trivalent formulation due to global disappearance of B/Yamagata lineage viruses[1][2].

Brand names

FluzoneFluarixAfluriaFluLavalFlucelvax

Other names

trivalent influenza vaccine, inactivatedTIV (trivalent inactivated vaccine)IIV3 (inactivated influenza vaccine, trivalent)split-virus flu shot (trivalent)