1. Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathogenesis, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, Georgia 30333, USA
2. Climate and Health Program, Division of Environmental Hazards and Health Effects, National Centers for Environmental Health, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, Georgia 30333, USA
3. Arthropod-borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 3195 Rampart Road, Fort Collins, Colorado 80523-1690, USA
4. Poxvirus and Rabies Branch, Division of Viral and Rickettsial Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, Georgia 30333, USA
5. Office of Institutional Research and Assessment, 2538 Dunford Hall, University of Tennessee, 915 Volunteer Boulevard, Knoxville, Tennessee 37996, USA