#$%^&*AU2013203816A120130502.pdf#####ABSTRACT The established dogma for meningococcus is thus that immunisation against serogroups A, C, W135 and Y shall be based on the four different capsular saccharides, and that immunisation against serogroup B shall not be based on the capsular saccharide. In contrast, the invention uses polypeptide antigens and/or OMVs to immunise against serogroups A, C, W135 and Y (and against serogroup Y in particular). Serogroup B polypeptides can achieve this protection, thus permitting a single polypeptide-based vaccine to be used for protecting against all of serogroups A, B, C, W 135 and Y.