1. California Veterinary Diagnostic Laboratory System, School of Veterinary Medicine, University of California, Davis, CA 95617
2. Department of Veterinary Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602
3. Department of Medical Microbiology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602
4. Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, SK S7N OWO, Canada
5. Anapath, Newport, New South Wales 2106, Australia
6. California Veterinary Diagnostic Laboratory System, School of Veterinary Medicine, University of California, San Bernardino, CA 92412