In researching best MenB vaccine and negotiating best possible pricing we needed to learn a little more about factor H binding protein AKA: fHBP.  Trumenba® the Pfizer vaccine has both of these proteins.  Bexsero® the Novartis vaccine only has one. Evidently, Evidently, vaccine development for the Neisseria meningitidis serogroups A, C, Y and W135 is a different from that required for serogroup B.  Below is an article on this subject for your further review. http://www.ncbi.nlm.nih.gov/pubmed/23699256