1 Institute of Medical Microbiology and Hygiene, Saarland University, Kirrberger Straße, Building 43, 66421 Homburg/Saar, Germany.
2 Division of Infectious Diseases and Tropical Medicine, LMU University Hospital Centre, Leopoldstraße 5, 80802 Munich, Germany.
3 Federal Foreign Office, Medical Service, Werderscher Markt 110117, Berlin, Germany.
4 Clinic for Gastroenterology, Hepatology and Infectiology, Tropical Medicine Outpatient Clinic and Yellow Fever Vaccination Center, University Hospital Düsseldorf, Moorenstraße 5A, 40225 Düsseldorf, Germany.
5 Division of Tropical Medicine, I. Department of Medicine, University Medical Center Hamburg-Eppendorf and Department of Tropical Medicine, Bernhard Nocht Institute for Tropical Medicine, Bernhard-Nocht-Straße 74D, 20359 Hamburg, Germany.
6 Department of Infectious Diseases and Tropical Medicine, University of Rostock, Ernst-Heydemann-Str. 618057 Rostock.