Affiliation: | 1Infection and Immunity Division, The Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Roslin, Midlothian EH25 9RG United Kingdom;2Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Universiteit Utrecht Yalelaan 1 3584CL Utrecht The Netherlands;3Department of Farm Animal Health, Faculty of Veterinary Medicine, Universiteit Utrecht Yalelaan 1 3584CL Utrecht The Netherlands |