1. Institute of Veterinary Bacteriology; Department of Infectious Diseases and Pathobiology; University of Bern; Länggassstrasse 122 Bern CH-3001 Switzerland
2. Clinic for Small Animal Internal Medicine; Dermatology unit; Vetsuisse Faculty University of Zurich; Winterthurerstrasse 260 Zurich CH-8057 Switzerland
3. Division of Clinical Dermatology; Department of Clinical Veterinary Medicine; University of Bern; Länggassstrasse 128 Bern CH-3001 Switzerland