1. Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado, USA
2. Division of Clinical Microbiology, Mayo Clinic, Rochester, Minnesota, USA
3. Minnesota Department of Health, St. Paul, Minnesota, USA
4. Vanderbilt University Medical Center, Nashville, Tennessee, USA
5. Tennessee Department of Health, Nashville, Tennessee, USA
6. Scientific Computing and Bioinformatics Support, Centers for Disease Control and Prevention, Atlanta, Georgia, USA