menactraâ®rnmeningococcal (groups a, c, y and w-135) polysacchariderndiphtheria toxoid conjugate vaccinernsolution for intramuscular injection menactra is indicated for active immunization to prevent invasive meningococcalrndisease caused by neisseria meningitidis serogroups a, c, y and w-135. Menactra isrnapproved for use in individuals 9 months through 55 years of age. Menactra does notrnprevent n meningitidis serogroup b disease. (1) single-dose vial, 0.5 ml