1. PO Box 647040, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040, USA
2. PO Box 647034, Washington Animal Disease Diagnostic Laboratory, Washington State University, Pullman, Washington 99164-6610, USA
3. Idaho Department of Fish and Game, 3316 16th St., Lewiston, Idaho 83501, USA
4. PO Box 646630, Animal Disease Research Unit, USDA Agricultural Research Service, Washington State University, Pullman, Washington 99164-6630, USA