1. Athens Veterinary Diagnostic Laboratory, Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
2. Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA
3. Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
4. Department of Population Health, Food Animal Health and Management, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
5. Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA