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Immunogenicity and safety of a quadrivalent meningococcal tetanus toxoid-conjugate vaccine (MenACYW-TT) in ≥56-year-olds: A Phase III randomized study. | LitMetric

AI Article Synopsis

Article Abstract

Background: Invasive meningococcal disease has a high mortality rate in individuals aged ≥56 years, but no vaccine is currently licensed in the USA for this age group. This study assessed the safety and immunogenicity of an investigational quadrivalent meningococcal tetanus toxoid conjugate vaccine (MenACYW-TT) compared with a meningococcal quadrivalent polysaccharide vaccine (MPSV4) in this age group.

Methods: This was a Phase III, modified double-blind, randomized, non-inferiority study (NCT02842866) across 35 clinical sites in the USA and Puerto Rico in individuals aged ≥56 years. A single dose of the MenACYW-TT (n = 451) or MPSV4 vaccine (n = 455) was administered on Day 0. A serum bactericidal assay with human (hSBA) and baby rabbit (rSBA) complement was used to measure antibodies against serogroups A, C, W, and Y test strains at baseline and Day 30. Safety data were collected up to six months post-vaccination.

Results: The seroresponse to MenACYW-TT was non-inferior to MPSV4 for each of the serogroups (A: 58.2% vs. 42.5%; C: 77.1% vs. 49.7%; W: 62.6% vs. 44.8%, Y: 74.4% vs. 43.4%, respectively). At Day 30, participants achieving hSBA titers ≥1:8 were higher for all serogroups after MenACYW-TT vs. MPSV4 (77.4-91.7 vs. 63.1-84.2%, respectively). No safety concerns were identified for either vaccine.

Conclusion: MenACYW-TT was well-tolerated and immunogenic in ≥56-year-olds, offering the potential to replace MPSV4 in this age group.

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Source
http://dx.doi.org/10.1016/j.vaccine.2020.04.067DOI Listing

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