1. Arthropod-borne and Infectious Diseases Laboratory, Foothills Campus, Colorado State University, Fort Collins, Colorado 80523, USA
2. Current address: National Wildlife Research Center, U.S. Department of Agriculture, 4101 La Porte Ave., Fort Collins, Colorado 80521, USA
3. Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, N.E., Atlanta, Georgia 30333, USA
4. Nevada Genomics Center, University of Nevada, Reno, Nevada 89557, USA