MenACWY is a vaccine that protects against four types of meningococcal bacteria: A, C, W, and Y. These bacteria can cause serious infections, including meningitis, which is an inflammation of the protective membranes covering the brain and spinal cord. The vaccine is typically recommended for preteens, teens, and certain high-risk groups. The MenACWY vaccine is usually given as a shot in the arm. It is important for individuals, especially those in close living conditions like college dorms, to receive this vaccine to help prevent outbreaks of meningococcal disease. Booster doses may be required for continued protection.