The NadA component is a fragment of the full-length protein derived from N. meningitidis strain 2996 (peptide 8 variant 2/3) 1 . The NHBA component is a recombinant fusion protein comprised of NHBA (peptide 2) 1 and accessory protein 953 derived from N. meningitidis strains NZ98/254 and 2996, respectively. The fHbp component is a recombinant fusion protein comprised of fHbp (variant 1.1) 1 and the accessory protein 936 derived from N. meningitidis strains MC58 and 2996, respectively. These 3 recombinant proteins are individually produced in Escherichia coli and purified through a series of column chromatography steps. The OMV antigenic component is produced by fermentation of N. meningitidis strain NZ98/254 (expressing outer membrane protein Porin A [PorA] serosubtype P1.4) 2 , followed by inactivation of the bacteria by deoxycholate, which also mediates vesicle formation. The antigens are adsorbed onto aluminum hydroxide.