1. Department of Clinical Microbiology, Mayo Clinic, Rochester, Minnesota, USA
2. Division of Vector Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO, USA
3. Minnesota Department of Health, St. Paul, MN, USA
4. Wisconsin Department of Health Services, Madison, WI, USA
5. University of Wisconsin–Madison, Madison, WI, USA
6. North Dakota Department of Health, Bismarck, ND, USA