<p>Polysaccharide Diphtheria Toxoid Conjugate Vaccine is indicated for active immunization to prevent invasive meningococcal disease caused by Neisseria meningitidis serogroups A, C, Y and W-135. This vaccine is approved for use in individuals 9 months through 55 years of age. Menactra does not prevent N meningitidis serogroup B disease.</p>