1. Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences
2. Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
3. Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, University of Michigan Medical Center, Ann Arbor, Michigan
4. Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas