influenza vaccine, inactivated, subunit, trivalent

**Influenza vaccine, inactivated, subunit, trivalent** is a **seasonal vaccine** containing purified hemagglutinin (HA) subunits from three influenza virus strains (two A subtypes, typically H1N1 and H3N2, and one B lineage, most recently B/Victoria lineage). It is **manufactured by inactivating virus grown in eggs or cell culture, splitting the viral particles, and further purifying subunits, chiefly the HA protein**. This vaccine induces immunity primarily by stimulating antibody production against the influenza virus HA and, to a lesser extent, NA proteins, thereby preventing infection or reducing disease severity. It is administered annually, with protection tailored to circulating viral strains under WHO and FDA recommendations. Indicated for all eligible individuals 6 months and older, especially in populations at higher risk of influenza complications[1][3][6][7].

Brand names

InfluvacFluvirinAgrifluFlucelvax

Other names

trivalent inactivated influenza vaccine subunittrivalent inactivated subunit influenza vaccineTIV subunit