1. Center for Animal Disease Modeling and Surveillance, Dept. Medicine & Epidemiology, School of Veterinary Medicine University of California Davis, One Shields Avenue, 2108 Tupper Hall Davis CA 95616 USA
2. College of Veterinary Medicine and Biomedical Sciences Colorado State University Fort Collins 80523‐1682
3. Biological Resources Division/Wildlife Health Branch and Office of Public Health National Park Service 1201 Oakridge Drive, Suite 200 Fort Collins CO 80525
4. Division of Resources Management and Science Yosemite National Park 9039 Village Drive Yosemite CA 95389 USA
5. Division of Resources Management and Science Yosemite National Park 5083 Foresta Road El Portal CA 95318 USA