1. Department of Surgical and Radiological Sciences, University of California-Davis, Davis, California.
2. Veterinary Medical Teaching Hospital, University of California-Davis, Davis, California.
3. Department of Population Health and Reproduction, and University of California-Davis, Davis, California.
4. Department of Pathology Microbiology and Immunology, University of California-Davis, Davis, California.
5. Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado.
6. Towson University Herpes Virus Laboratory, Department of Biological Sciences, Towson University, Towson, Maryland.