1 Institute of Medical Microbiology, University of Münster, Münster, Germany; Masanga Medical Research Unit (MMRU), Masanga, Sierra Leone; Centre de Recherches Médicales, (CERMEL), Lambaréné, Gabon.
2 Masanga Medical Research Unit (MMRU), Masanga, Sierra Leone; Centre de Recherches Médicales, (CERMEL), Lambaréné, Gabon; Center of Tropical Medicine and Travel Medicine, Department of Infectious Diseases, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands; Institute of Tropical Medicine & Deutsches Zentrum für Infektionsforschung, University of Tübingen, Tübingen, Germany; Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa. Electronic address: m.p.grobusch@amsterdamumc.nl.