1Division of Poultry, Fish and Fur Animals, National Veterinary Institute, Technical University of Denmark, Arhus N, Denmark.
2Symantix Ltd, Wiltshire, UK
3Community Reference Laboratory for Fish Diseases, Section for Fish Diseases, Division of Poultry, Fish and Fur Animals, National Veterinary Institute, Technical University of Denmark, Århus N, Denmark
4Fisheries Research Services (FRS) Marine Laboratory, Aberdeen, UK.