1. Food and Agriculture Organization of the United Nations, Animal Production and Health Division, 00153 Rome, Italy
2. Animal Population Health Institute, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Campus Stop 1644, Fort Collins, CO 80523, USA
3. Veterinary Epidemiology, Economics and Public Health, The Royal Veterinary College, Hatfield AL9 7TA, UK
4. Food and Agriculture Organization of the United Nations European Commission for the Control of FMD, 00153 Rome, Italy
5. Wageningen Bioveterinary Research, P.O. Box 65, 8200 AB Lelystad, The Netherlands