1 Department of Veterinary Pathobiology, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907-2027.
| 2 Center for Veterinary Biologics, USDA-Animal and Plant Health Inspection Service-Veterinary Services, Ames, IA 50010.
| 3 Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907-2027.
| 4 Department of Veterinary Pathobiology, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907-2027.
| 5 Present address is the Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843-4458.
| 6 Banfield, The Pet Hospital, 11815 NE Glenn Widing Dr, Portland, OR 97220.
| 7 Department of Veterinary Pathobiology, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907-2027.