Affiliation: | 1.National Veterinary Institute,Oslo, Sentrum,Norway;2.Section of Immunology, BVF,Swedish University of Agricultural Sciences (SLU),Uppsala,Sweden;3.National Veterinary Institute, SVA,Uppsala,Sweden;4.INRA, UMR1079,Rennes,France;5.Norwegian Pig Health Service,Oslo, ?kern,Norway;6.Swedish Animal Health Service,Uppsala,Sweden;7.Norwegian School of Veterinary Science,Oslo,Norway;8.Department of Clinical Sciences,Swedish University of Agricultural Sciences (SLU),Uppsala,Sweden |