Affiliations:
1. Department of Veterinary Pathobiology, College of Veterinary Medicine and Biological Sciences, Texas A&M University, College Station, Texas, United States (G. Verocai, C. Sobotyk) 77843 USA.
2. North 10th Street Animal Hospital, McAllen, Texas, United States (A. Lamison)
3. Texas A&M Veterinary Medical Diagnostic Laboratory, College Station, TX, USA (M. Borst, E. Edwards)