1. Plum Island Animal Disease Center (PIADC), ARS, USDA, P.O. Box 848, Greenport, NY 11944, USA
2. College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA
3. ORISE-PIADC Research Participation Program, Oak Ridge, TN 37831, USA
4. Department of Pathobiology and Veterinary Science, University of Connecticut, Storrs, CT 06269, USA
5. National Bio and Agro-Defense Facility (NBAF), ARS, USDA, Manhattan, KS 66502, USA