W135 Meningococcal Disease in Africa by Pollard, A, Santamaria, M, Maiden, M, Nicolas, P, Handford, S, Issa, M, Longworth, E, Jacobsson, S, Parent du Chatelet, I, Koumare, B, Soriano-Gabarro, M, Achtman, M, Greenwood, B, LaForce, M