1. Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
2. Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Ankerstraat 1, 8400 Ostend, Belgium
3. Flanders Marine Institute (VLIZ), InnovOcean Site, Wandelaarskaai 7, 8400 Ostend, Belgium