[1] US Geol Survey, Natl Wildlife Hlth Ctr, Wildlife Dis Diagnost Labs Branch, Diagnost Virol Lab, Madison, WI USA
[2] US Geol Survey, Natl Wildlife Hlth Ctr, Madison, WI USA
[3] USDA, Ames, IA USA
[4] Washington State Univ, Pullman, WA 99164 USA
[5] Washington Dept Agr, Olympia, WA USA
[6] Washington Dept Fish & Wildlife, Olympia, WA USA
[7] USDA, Ft Collins, CO USA