Repeated clinical malaria episodes are associated with modification of the immune system in children by Bediako, Y, Adams, R, Reid, A, Valletta, J, Ndungu, F, Sodenkamp, J, Mwacharo, J, Ngoi, J, Kimani, D, Kai, O, Wambua, J, Nyangweso, G, De Villiers, E, Sanders, M, Lotkowska, M, Lin, J, Manni, S, Addy, J, Recker, M, Newbold, C, Berriman, M, Bejon, P, Marsh, K, Langhorne, J