1. Centre for Tropical Veterinary Medicine, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Veterinary Centre, Roslin, Midlothian
2. Department of Medical Microbiology, Medical School, University of Edinburgh, Edinburgh
3. Epidemiology Unit, Scottish Agricultural College, Drummondhill, Inverness
4. Centre for Epidemiology and Risk Analysis, Veterinary Laboratories Agency, Weybridge, New Haw, Addlestone, Surrey
5. Scottish Agricultural College, Bush Estate, Penicuik, Midlothian, United Kingdom