1. COVID-19 Response Team, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Epidemic Intelligence Service, CDC, Atlanta, Georgia, USA
3. Wisconsin Department of Health Services, Madison, Wisconsin, USA
4. Department of Population Health Sciences, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
5. Laboratory Leadership Service, CDC, Atlanta, Georgia, USA
6. University Health Services, University of Wisconsin-Madison, Madison, Wisconsin
7. University of Wisconsin Oshkosh, Oshkosh, Wisconsin, USA
8. Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA