1. Institute of Medical Virology, Hospital of the Johann Wolfgang Goethe University, D-60596 Frankfurt am Main
2. Bernhard-Nocht-Institute for Tropical Medicine, Clinical Virology Laboratory, D-20359 Hamburg
3. Department of Dermatology and Venereology, University of Rostock, D-18055 Rostock
4. Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute for Novel and Emerging Infectious Diseases, D-17493 Greifswald, Germany