1. DermatoDiagnostics, Edmonds, WA 99026, Phoenix Central Laboratory, Everett, WA 98204, and Department of Comparative Medicine, University of Washington, Seattle, WA 98195, USA,
2. Department of Pathobiology, University of Florida, Gainesville, FL 32611, USA,
3. Texas Veterinary Medical Diagnostic Laboratory, College Station, TX 77841, USA,
4. PathoGenesis Corporation, Seattle, WA 98119, USA