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Pediatric Infectious Disease Journal:
doi: 10.1097/INF.0b013e3182054ab9
Online-Only: Original Studies

Immunogenicity and Safety of an Investigational Quadrivalent Meningococcal ACWY Tetanus Toxoid Conjugate Vaccine in Healthy Adolescents and Young Adults 10 to 25 Years of Age

Baxter, Roger MD*; Baine, Yaela PhD†; Ensor, Kathleen BA, RN*; Bianco, Veronique MS‡; Friedland, Leonard R. MD†; Miller, Jacqueline M. MD†

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Background: An investigational quadrivalent Neisseria meningitidis serogroups A, C, W-135, and Y tetanus toxoid conjugate vaccine (MenACWY-TT) has been developed to expand available options for vaccination against invasive meningococcal disease.

Methods: A total of 784 healthy adolescents and young adults 11 to 25 years of age were randomized (3:1) to receive a single dose of the MenACWY-TT vaccine or a licensed MenACWY diphtheria toxoid conjugate vaccine (MenACWY-DT). An additional nonrandomized group of 88 subjects 10 years of age received the MenACWY-TT vaccine only (MenACWY-TT/10). Immunogenicity was assessed 1 month postvaccination by human complement serum bactericidal assay (hSBA) for all serogroups. Solicited local and general symptoms were recorded for 8 days postvaccination and safety outcomes for 6 months.

Results: One month postvaccination, 81.9% to 96.1% of subjects had hSBA titers ≥1:8 in the MenACWY-TT group compared with 70.7% to 98.8% in the MenACWY-DT group. Exploratory analyses showed the proportion of subjects with hSBA titers ≥1:4 and ≥1:8 to be higher in the MenACWY-TT group than in the MenACWY-DT group for serogroups A, W-135, and Y. GMTs adjusted for age strata and baseline titer 1 month postvaccination were higher in the MenACWY-TT group than in the MenACWY-DT group for all 4 serogroups. The percentage of subjects reporting solicited local and general symptoms of any or Grade 3 severity or serious adverse events was similar between the 2 groups. Immune response and reactogenicity in the MenACWY-TT/10 group was similar to that in the MenACWY-TT group, except for higher hSBA-MenA GMTs in the MenACWY-TT/10 group.

Conclusions: The investigational MenACWY-TT vaccine was immunogenic in adolescents and young adults, with an acceptable safety profile.

© 2011 Lippincott Williams & Wilkins, Inc.


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