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Neisseria meningitidis group c capsular polysaccharide diphtheria toxoid conjugate antigen is an active intramuscular immunization for the prophylaxis of invasive meningococcal disease caused by Neisseria meningitidis serogroup c. The vaccine contains N. meningitis serogroup c capsular polysaccharide antigens that are purified and individually conjugated to diphtheria toxoid protein that are extracted from Corynebacterium diphtheriae grown in another culture.