1. Wildlife Health Center, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, California 95616, USA
2. Alaska Veterinary Pathology Services, 23834 The Clearing Drive, Eagle River, Alaska 99577, USA
3. Alaska Department of Fish and Game, 1300 College Road, Fairbanks, Alaska 99701, USA
4. Washington Animal Disease Diagnostic Laboratory, College of Veterinary Medicine, Washington State University, 402 Bustad Hall, PO Box 647040, Pullman, Washington 99164, USA
5. Field Disease Investigation Unit, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Laboratory ADBF 3059, Pullman, Washington 99164, USA