1. Division of Retrovirology, Robert Koch Institute, D-13353 Berlin
2. Max Planck Institute for Evolutionary Anthropology, D-04103 Leipzig
3. Institute for Parasitology and International Animal Health, Free University of Berlin, 14163 Berlin, Germany
4. Ebola Taï Forest Project, World Health Organization, Abidjan
5. Lanada/Lcpa, Bingerville, Côte d'Ivoire
6. University of Montpellier 1, 34032 Montpellier Cedex 1, France