1. University Animal Hospital; Box 7040; SE-750 07; Uppsala; Sweden
2. Department of Biomedical Sciences and Veterinary Public Health, Division of Bacteriology and Food Safety; Swedish University of Agricultural Sciences; Box 7009; SE-750 07; Uppsala; Sweden
3. Department of Animal Health and Antimicrobial Strategies; National Veterinary Institute (SVA); SE-75189; Uppsala; Sweden