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Effect of a serogroup A meningococcal conjugate vaccine (PsA-TT) on serogroup A meningococcal meningitis and carriage in Chad: a community trialDaugla, D M; Gami, J P; Gamougam, K; Naibei, N; Mbainadji, L; Narbé, M; Toralta, J; Kodbesse, B; Ngadoua, C; Coldiron, M E; et al. (Elsevier, 2013-09-11)A serogroup A meningococcal polysaccharide-tetanus toxoid conjugate vaccine (PsA-TT, MenAfriVac) was licensed in India in 2009, and pre-qualified by WHO in 2010, on the basis of its safety and immunogenicity. This vaccine is now being deployed across the African meningitis belt. We studied the effect of PsA-TT on meningococcal meningitis and carriage in Chad during a serogroup A meningococcal meningitis epidemic.