1. Department of Pathology, Texas Tech University Health Sciences Center, 3601 4th Street, Lubbock, Texas 79430, USA
2. National Wildlife Health Center, U.S. Geological Service, Biological Resources Division, 6006 Schroeder Road, Madison, Wisconsin 53711, USA
3. DuPont Agricultural Products, Barley Mill Plaza, Wilmington, Delaware 19880-0015, USA
4. Southeastern Cooperative Wildlife Disease Study, College of Veterinary Medicine, The University of Georgia, Athens, Georgia 30602, USA