1. US Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, 4101 LaPorte Avenue, Fort Collins, Colorado 80521, USA
2. Colorado State University, Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, 200 W Drake Road, Fort Collins, Colorado 80523, USA
3. US Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, 1860 W Alexander Street, Suite A, West Valley City, Utah 84119, USA
4. US Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, 6731 W Coal Road, Casper, Wyoming 82604, USA
5. US Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, 9001 E Frontage Road, Palmer, Alaska 99645, USA
6. US Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center, 4101 LaPorte Avenue, Fort Collins, Colorado 80521, USA