Phase variation of Opa proteins of Neisseria meningitidis and the effects of bacterial transformation by Sadarangani, M, Hoe, JC, Makepeace, K, van der Ley, P, Pollard, AJ

Construction of Opa-positive and Opa-negative strains of Neisseria meningitidis to evaluate a novel meningococcal vaccine by Sadarangani, M, Hoe, J, Callaghan, M, Jones, C, Chan, H, Makepeace, K, Daniels-Treffandier, H, Deadman, M, Bayliss, C, Feavers, I, Van Der Ley, P, Pollard, A