1. University of Vermont Larner College of Medicine, Burlington, VT
2. National Institute of Allergy and Infectious Diseases, Bethesda, MD
3. University of Ulm, Ulm, Germany
4. University of Bern, Bern, Switzerland
5. Virginia–Maryland College of Veterinary Medicine, Blacksburg, VA
6. Virginia Department of Wildlife Resources, Blacksburg, VA
7. IDEXX Reference Laboratories, Westbrook, ME