1. Swiss Tropical and Public Health Institute, Kreuzstrasse 2, 4123 Allschwil, Switzerland
2. Faculty of Science, University of Basel, Petersplatz 1, 4003 Basel, Switzerland
3. Institute of Health Science, Jigjiga University, Jigjiga P.O. Box 1020, Ethiopia
4. Armauer Hansen Research Institute, Addis Ababa P.O. Box 1005, Ethiopia
5. Department of Fundamental Microbiology, University of Lausanne, UNIL-Sorge, 1015 Lausanne, Switzerland