1. Institute of Immunology, National Public Health Laboratory, 20A rue Auguste Lumière, L-1950 Luxembourg, Luxembourg
2. Department of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
3. Institut de Recherche en Sciences de la Santé, 399 Avenue de la liberté, BP 545 Bobo-Dioulasso, Burkina Faso
4. Laboratoire National de l'Elevage, 03 BP 7026 Ouagadougou, Burkina Faso
5. Department of Virology, Erasmus Medical Center, Dr Molewaterplein 50, 3015 GE Rotterdam, The Netherlands