International patent application WO99/61053 discloses immunogenic compositions that comprise N.meningitidis serogroup C oligosaccharide conjugated to a carrier, in combination with N.meningitidis serogroup B outer membrane protein. These are disclosed in the present application in combination with further Neisserial proteins and/or protective antigens against other pathogenic organisms ( e.g. Haemophilus influenzae, DTP, HBV, etc. ).