Fluenz Tetra is a nasal spray vaccine designed to protect against influenza, commonly known as the flu. It is a live attenuated influenza vaccine (LAIV) that contains weakened forms of the flu virus. Fluenz Tetra is specifically formulated to target four different strains of the influenza virus, offering broad protection against the illness. This vaccine is typically administered through the nostrils, making it a needle-free option that is especially appealing for use in children, who are among its primary recipients. It is designed to stimulate the immune system to produce an immune response that will protect against the flu. The use of Fluenz Tetra is subject to medical guidelines and is approved for individuals in specific age groups, making it important to consult healthcare professionals for its suitability and administration.