Effectiveness of Meningococcal B Vaccine against Endemic Hypervirulent Neisseria meningitidis W Strain, England - Ladhani, SN; Giuliani, MM; Biolchi, A; Pizza, M; Beebeejaun, K; Lucidarme, J; Findlow, J; Ramsay, ME; Borrow, R (EMERGING INFECTIOUS DISEASES, 2016)