1. Disease Dynamics Unit; Department of Veterinary Medicine; University of Cambridge; Madingley Road Cambridge CB3 0ES UK
2. Department of Biology; Colorado State University; Fort Collins CO 80523 USA
3. Institute of Zoology; Zoological Society of London; London NW1 4RY UK
4. Animal Health and Veterinary Laboratories Agency; Weybridge Surrey KT15 3NB UK
5. Fogarty International Center; National Institutes of Health; Bethesda MD 20892 USA
6. Department of Biology; University of Florida; Gainesville FL 32611 USA
7. Emerging Pathogens Institute; University of Florida; Gainesville FL 32610 USA
8. Center for Infectious Disease Dynamics; The Pennsylvania State University; University Park PA 16802 USA
9. Department of Defense; Frederick MD 21702 USA
10. Department of Biomedical Sciences; Colorado State University; Fort Collins CO 80523 USA
11. The National Centre for Zoonosis Research, University of Liverpool; Leahurst Neston South Wirral CH64 7TE UK