1. Department of Medicine and Epidemiology School of Veterinary Medicine University of California Davis CA 95616 USA
2. Department of Clinical Sciences College of Veterinary Medicine NC State University 1060 William Moore Drive Raleigh NC 27607 USA
3. Departments of Pathology, Microbiology and Immunology School of Veterinary Medicine University of California Davis CA 95616 USA
4. Department of Dermatology St George Hospital University of New South Wales Sydney NSW 2217 Australia
5. Principia Biopharma Inc. 400 E Jamie Ct South San Francisco CA 94080 USA
6. William R. Pritchard Veterinary Medical Teaching Hospital School of Veterinary Medicine University of California Davis CA 95616 USA