1. Program in Vector-borne Disease, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, USA
2. Institute of Biological Chemistry, Washington State University, Pullman, Washington, USA
3. United States Department of Agriculture, Agricultural Research Service, Animal Disease Research Unit, Pullman, Washington, USA
4. School of Molecular Biosciences, Washington State University, Pullman, Washington, USA