1. Departments of Veterinary Pathobiology, College of Veterinary Medicine & Biomedical Science, Texas A&M University, College Station, TX, USA
2. Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Science, Texas A&M University, College Station, TX, USA
3. Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California–Davis, Davis, CA, USA