1 Swiss Tropical and Public Health Institute, PO Box, 4002 Basel, Switzerland; University of Basel, Petersplatz 1, 4003 Basel, Switzerland.
2 Laboratoire Central Vétérinaire, PO Box 2295, Bamako, Mali.
3 Swiss Tropical and Public Health Institute, PO Box, 4002 Basel, Switzerland; University of Basel, Petersplatz 1, 4003 Basel, Switzerland; Centre Suisse de Recherche Scientifique en Côte d'Ivoire (CSRS), Abidjan, Côte d'Ivoire.
4 Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany.
5 Swiss Tropical and Public Health Institute, PO Box, 4002 Basel, Switzerland; University of Basel, Petersplatz 1, 4003 Basel, Switzerland. Electronic address: jakob.zinsstag@swisstph.ch.