1 Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries & Economics, University of Tromsø - The Arctic University of Norway, Tromsø, Norway.
2 Department of Pathology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA.
3 Department of Immunology and Microbiology, Institute of Medical Biology, University of Southern Denmark, Odense, Denmark.
4 Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries & Economics, University of Tromsø - The Arctic University of Norway, Tromsø, Norway. jorunn.jorgensen@uit.no.