1. Department of Virology, Fondation Institut Pasteur de Dakar 36, Avenue Pasteur, Dakar 220, Senegal
2. Department of Medical Zoology, Fondation Institut Pasteur de Dakar 36, Avenue Pasteur, Dakar 220, Senegal
3. DIATROPIX, Fondation Institut Pasteur de Dakar 36, Avenue Pasteur, Dakar 220, Senegal
4. Institute of Microbiology and Virology, Brandenburg Medical School Theodor Fontane, 01968 Senftenberg, Germany