1. Department of Companion Animal and Special Species Medicine, North Carolina State University, College of Veterinary Medicine, 4700 Hillsborough Street, Raleigh, NC
2. Department Pathology, and Parasitology, North Carolina State University, College of Veterinary Medicine, 4700 Hillsborough Street, Raleigh, NC
3. Oak Ridge National Laboratory, Biology Division, Oak Ridge, TN
4. Department of Pathology, University of Tennessee, College of Veterinary Medicine, PO Box 1071, Knoxville, TN