Menveo is a vaccine that is used for active immunization of adolescents (from 11 years of age) and adults at risk of exposure to Neisseria meningitidis serogroups A, C, W135 and Y, to prevent invasive disease. The vaccine works by causing your body to make its own protection (antibodies) against these bacteria. This vaccine can only protect against meningococcal group A, C, W135, and Y bacteria. It cannot protect against other types of meningococcal bacteria other than groups A, C, W135 and Y, or against other causes of meningitis and sepsis (blood poisoning).