1. Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas.
2. Biosecurity Research Institute, Kansas State University, Manhattan, Kansas.
3. Arthropod-borne Animal Disease Research Unit, Agriculture Research Service, United States Department of Agriculture, Manhattan, Kansas.
4. Department of Pathology, University of Texas Medical Branch, Galveston, Texas.
5. Sealy Center for Vaccine Development, University of Texas Medical Branch, Galveston, Texas.