The Quadrivalent Influenza Vaccine is designed to protect against four strains of the influenza virus: two A strains and two B strains. This vaccine helps reduce the risk of getting the flu and its complications, especially during the flu season. It is recommended for individuals aged six months and older. The vaccine works by stimulating the immune system to recognize and fight off the influenza viruses. It is typically administered as an injection and is available in both standard and high-dose formulations for specific populations, such as the elderly. Regular vaccination is important for public health and individual protection.