1. Institute of Virology and Immunoprophylaxis; Sensemattstrasse 293 3147 Mittelhäusern Switzerland
2. National Centre for Zoonoses; Bacterial Animal Diseases and Antimicrobial Resistance
3. Molecular and Bacterial Epidemiology and Infectiology; Institute of Veterinary Bacteriology; University of Berne; 3001 Berne Switzerland
4. Central Veterinary Laboratories; Diagnostic and Research Branch; Department of Veterinary Technical Services; PO Box CY551, Causeway Harare Zimbabwe