1. Department of Animal Health and Antimicrobial Resistance, National Veterinary Institute, SE-751 89 Uppsala, Sweden, Department of Clinical Sciences, Box 7054, Swedish University of Agricultural Sciences, SLU, SE-750 07 Uppsala, Sweden
bodil.strom-holst@kv.slu.se
2. Department of Disease Control, National Veterinary Institute, SE-751 89 Uppsala, Sweden