Affiliation: | 1.Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden;2.Department of Disease Control and Epidemiology, National Veterinary Institute, Uppsala, Sweden;3.Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Skara, Sweden;4.Department of Virology, Immunobiology and Parasitology, National Veterinary Institute, Uppsala, Sweden |