Affiliation: The Alliance for International Medical Action, Route de l'Aéroport, Rue NG 96 BP: 15530, Dakar, Senegal; Department of Infectious Diseases, Centre Hospitalier National de Zinder, Zinder, Niger.
Affiliation: Department of Infectious Diseases, Bern University Hospital, University of Bern, Bern, Switzerland; Graduate School of Health Sciences, University of Bern, Bern, Switzerland; Service de Maladies Infectieuses et Tropicales, Fann University Hospital, Dakar, Senegal.