1. Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado.
2. Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama.
3. Department of Entomology, North Carolina State University, Raleigh, North Carolina.
4. Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama.
5. Representing the entire CDC laboratory team (see Acknowledgments).
6. Gorgas Center for Geographic Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
7. Memphis/Shelby County Vector Control, Memphis, Tennessee.
8. Representing the entire Memphis/Shelby County Vector Control Field Team (see Acknowledgments).