Flucelvax Tetra is an inactivated quadrivalent influenza vaccine designed to protect against four different flu viruses, including two influenza A viruses and two influenza B viruses. It is produced using cell culture technology, which is an alternative to the traditional egg-based production method for flu vaccines. This makes it suitable for individuals with egg allergies. Flucelvax Tetra is administered as an injection, typically into the muscle, and is recommended for people aged six months and older as part of annual flu vaccination efforts to reduce the incidence and severity of influenza. The vaccine works by stimulating the body's immune system to produce antibodies against the flu, providing protection against the strains included in the vaccine.