1. Colorado Parks and Wildlife, Wildlife Health Program, 4330 Laporte Avenue, Fort Collins, Colorado 80521, USA
2. Virginia-Maryland Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
3. Colorado State University, College of Veterinary Medicine and Biomedical Sciences, Veterinary Diagnostic Laboratory, 300 W Drake Road, Fort Collins, Colorado 80526, USA