1. Division of Public Health, Wisconsin Department of Health Services, Madison, Wisconsin;
2. Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin;
3. Arboviral Diseases Branch, Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado;
4. Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin;
5. Career Epidemiology Field Officer, Office of Public Health Preparedness and Response, Centers for Disease Control and Prevention, Atlanta, Georgia;
6. Wisconsin State Laboratory of Hygiene, Madison, Wisconsin