1. Department of Veterinary Medicine and Epidemiology (Johnson) and Department of Pathology, Microbiology, and Immunology (Fry); and the Veterinary Medical Teaching Hospital Microbiology Service (Jang), University of California, Davis, California 95616; and the Care Veterinary Clinic (Anez, Proctor), 1946 West Dorothea, Visalia, California 93277
2. From the