1. Wyoming State Veterinary Laboratory; University of Wyoming; 1174 Snowy Range Road Laramie Wyoming 82070 USA
2. Animal Disease Research Unit; United States Department of Agriculture-Agricultural Research Service; Washington State University; Pullman Washington 99164 USA
3. Cloud Peak Veterinary Services; North 10th Street Worland Wyoming 82401 USA
4. Hot Springs Veterinary Clinic; 827 South 6th Street Thermopolis Wyoming 82443 USA
5. Department of Veterinary Microbiology and Pathology; Washington State University; Pullman Washington 99164 USA