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)