1. Arthropod-Borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado.
2. Current address: Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Laboratorio de Arbovirología, Universidad Autónoma de Yucatán, Mérida, Yucatán, México.
3. Center for Biodefense and Emerging Infectious Diseases, Department of Microbiology and Immunology, Department of Pathology, University of Texas Medical Branch Galveston, Texas.
4. Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado.