1. Operational Direction Viral Diseases, CODA-CERVA, Groeselenberg 99, 1180 Ukkel, Belgium
2. Experimental Center, CODA-CERVA, Kerklaan 68, 1830 Machelen, Belgium
3. Operational Direction Interactions and Surveillance, CODA-CERVA, Groeselenberg 99, 1180 Ukkel, Belgium
4. Department of Virology, Immunology and Parasitology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium