1. Colorado State University, College of Veterinary and Biomedical Sciences, 1601 Campus Delivery, Fort Collins, Colorado 80523-1601, USA
2. CSU Veterinary Diagnostic Lab, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 300 W Drake Rd., Fort Collins, Colorado 80523-1644, USA
3. Department of Pathobiology, Ontario Veterinary College, University of Guelph, 50 Stone Rd., Guelph, Ontario N1G 2W1, Canada
4. Centers for Disease Control and Prevention, Rickettsial Zoonoses Branch, 1600 Clifton Rd., Atlanta, Georgia 30329, USA
5. British Columbia Ministry of Agriculture, Animal Health Center, 1767 Angus Campbell Rd., Abbotsford, British Columbia V3G2M3, Canada
6. National Marine Fisheries Service, Alaska Fisheries Science Center, Marine Mammal Lab, 7600 Sand Point Way NE, Seattle, Washington 98115, USA