1. Department of Microbiology and Immunology, Baker Institute for Animal Health, College of Veterinary Medicine Cornell University Ithaca New York
2. Department of Clinical Sciences, College of Veterinary Medicine Cornell University Ithaca New York
3. Walnridge Equine Clinic Cream Ridge New Jersey
4. Mid‐Rivers Equine Centre Wentzville Missouri
5. Department of Clinical Sciences North Carolina State College of Veterinary Medicine Raleigh North Carolina
6. Georgia Equine Veterinary Services and Hospital Canton Georgia
7. Department of Veterinary Medicine and Surgery University of Missouri Columbia Missouri
8. Department of Clinical Sciences, College of Veterinary Medicine Oklahoma State University Stillwater Oklahoma
9. Department of Biomedical Sciences, Carlson College of Veterinary Medicine Oregon State University Corvallis Oregon
10. Department of Clinical Sciences, Carlson College of Veterinary Medicine Oregon State University Corvallis Oregon
11. New York State Animal Health Diagnostic Center Cornell University Ithaca New York
12. Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine Cornell University Ithaca New York
13. Center for Vaccines and Immunity Research Institute at Nationwide Children's Hospital Columbus Ohio
14. Mid‐Atlantic Equine Medical Center Ringoes New Jersey
15. Department of Pathobiology, New Bolton Center University of Pennsylvania Kennett Square Pennsylvania