1 Centre for Tropical Medicine and Travel Medicine, Department of Infectious Diseases, Amsterdam University Medical Centres, Location AMC, Amsterdam Public Health, Amsterdam Infection & Immunity, University of Amsterdam, Meibergdreef 9, 1105, AZ, Amsterdam, the Netherlands; Institute of Infectious Diseases and Molecular Medicine IDM, University of Cape Town, Cape Town, South Africa; Institut für Tropenmedizin, University of Tübingen, Tübingen, Germany; Centre de Reserchers Médicales CERMEL, Lambaréné, Gabon; Masanga Medical Research Unit, Masanga, Sierra Leone. Electronic address: m.p.grobusch@amsterdamumc.nl.
2 Masanga Medical Research Unit, Masanga, Sierra Leone; Institute of Medical Microbiology, University Hospital Münster, Münster, Germany.
3 International Health Management Consultants S.A. iNHEMACO, Geneva, Switzerland; School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.