1. Department Biocontrol/Section Epidemiology; Boulevard de Colonster B43 Bis; 4000 Sart Tilman Liège Belgium
2. Department of Infectious and Parasitic Diseases; Virology and Epidemiology; FMV; University of Liège; Boulevard de Colonster B43 Bis; 4000 Sart Tilman Liège Belgium
3. UMR960 Departement de Microbiologie Moleculaire; Ecole Nationale Veterinaire; 23, chemin des Capelles F-31076 Toulouse Cedex 3 France
4. Department of Virology; Veterinary and Agrochemical Research Centre; Groeselenberg 99 1180 Brussels Belgium