[1] Natl Vet Inst, Dept Anim Hlth & Antimicrobial Strategies, Uppsala, Sweden
[2] Swedish Univ Agr Sci, Dept Clin Sci, SE-75007 Uppsala, Sweden
[3] Helsingborg Anim Hosp, SE-25023 Helsingborg, Sweden
[4] Natl Vet Inst, Dept Bacteriol, SE-75189 Uppsala, Sweden
[5] Swedish Board Agr, S-55182 Jonkoping, Sweden
[6] Natl Vet Inst, Dept Dis Control & Epidemiol, SE-75189 Uppsala, Sweden