1. Department of Pathology, Microbiology and Immunology, University of California, Davis, CA 95616
2. Clear Springs Foods, PO Box 712, Buhl, ID 83316
3. School of Veterinary Medicine, and the Department of Pathology, School of Medicine, University of California, Davis, CA 95616
4. California Veterinary Diagnostic Laboratory, University of California, Davis, CA 95616