1. Department of Medical Microbiology and Infectious Diseases Erasmus MC University Medical Center Rotterdam Rotterdam the Netherlands
2. Faculty of Medical Laboratory Sciences University of Khartoum Khartoum Sudan
3. Institute of Endemic Diseases University of Khartoum Khartoum Sudan
4. Swiss Tropical and Public Health Institute (Swiss TPH) Allschwil Switzerland
5. Faculty of Science University of Basel Basel Switzerland