1. Veterinary Services, Animal and Plant Health Inspection Service, US Department of Agriculture, 187 E Tobiano Trail, Belgrade, Montana 59714, USA
2. Wildlife Disease Laboratory, Wyoming Game and Fish Department, 1174 Snowy Range Road, Laramie, Wyoming 82070, USA
3. National Veterinary Services Laboratories, Veterinary Services, Animal and Plant Health Inspection Service, 1920 Dayton Avenue, Ames, Iowa 50010, USA
4. Marsh Laboratory, Montana Department of Livestock, S 19th and Lincoln St., Bozeman, Montana 59718, USA
5. Idaho State Diagnostic Laboratory, Veterinary Services, Animal and Plant Health Inspection Service, US Department of Agriculture, 2230 Old Penitentiary Road, Boise, Idaho 83712, USA
6. Risk Assessment Division, Office of Public Health and Science, Food Safety Inspection Service, US Department of Agriculture, 2150 Centre Avenue, Building D, Fort Collins, Colorado 80526, USA
7. Marsh Laboratory, Veterinary Services, Animal and Plant Health Inspection Service, US Department of Agriculture, S 19th and Lincoln St., Bozeman, Montana 59718, USA
8. Animal Health Laboratory, Idaho State Department of Agriculture, 2230 Old Penitentiary Road, Boise, Idaho 83712, USA