Affiliation: | (1) National Veterinary Institute, SE-751 89 Uppsala, Sweden;(2) Institute of Veterinary Bacteriology, University of Bern, Laenggass-Str. 122, CH-3001 Bern, Switzerland;(3) Division of Food Hygiene and Bacteriology, Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden; |