1. Department of Pathology, University of Georgia, Athens, GA, USA
2. Department of Population Medicine and Diagnostic Sciences, Cornell University, Ithaca, NY, USA
3. Department of Pathobiology, Auburn University, Auburn, AL, USA
4. Department of Pathobiology, University of Illinois, Urbana, IL, USA
5. Athens Veterinary Diagnostic Laboratory, University of Georgia, Athens, GA, USA
6. Tifton Veterinary Diagnostic and Investigational Laboratory, University of Georgia, Athens, GA, USA