1. North Carolina Veterinary Diagnostic Laboratory, Rose Hill, NC (McComb), Cornell University, Ithaca, NY
2. New York State Animal Health Diagnostic Center (Bischoff, Thompson, Ebel, Hillebrandt), Cornell University, Ithaca, NY
3. Department of Population Medicine and Diagnostic Sciences (Bischoff, Mohammed), Cornell University, Ithaca, NY
4. Ambulatory and Production Medicine Service (Smith), Cornell University, Ithaca, NY