1. Department of Veterinary Pathobiology, Center for Veterinary Health Sciences
2. Oklahoma State University, Stillwater, OK (Cramer, Njaa, Smith)
3. Oklahoma Animal Disease Diagnostic Laboratory, Stillwater, OK (Campbell, Morgan)
4. McLin Veterinary Services, Elmore City, OK (McLin)
5. Veterinary Diagnostic Center, School of Veterinary Medicine and Biomedical Sciences, University of Nebraska–Lincoln, Lincoln, NE (Brodersen)