A framework for Controlled Human Infection Model (CHIM) studies in Malawi: Report of a Wellcome Trust workshop on CHIM in Low Income Countries held in Blantyre, Malawi by Gordon, S, Rylance, J, Luck, A, Jambo, K, Ferreira, D, Manda-Taylor, L, Bejon, P, Ngwira, B, Littler, K, Seager, Z, Gibani, M, Gmeiner, M, Roestenberg, M, Mlombe, Y