MENQUADFI is a vaccine designed to protect against meningococcal disease, which is caused by the bacteria Neisseria meningitidis. This vaccine specifically targets four of the major serogroups of the bacteria: A, C, W, and Y, which are responsible for the majority of meningococcal cases in many parts of the world. MENQUADFI works by stimulating the body's immune system to produce antibodies against these serogroups, providing immunity and reducing the risk of developing meningococcal disease. Meningococcal disease can lead to serious health complications, including meningitis and septicemia, making vaccination an important preventive measure. MENQUADFI is typically administered through an injection and is recommended for individuals in certain age groups or those at increased risk of infection.