1. Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, USA
2. Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, USA
3. Animal Disease Research Unit, USDA Agricultural Research Service, Washington State University, Pullman, Washington, USA
4. School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington, USA
5. Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA