1. Division of Infectious Diseases, The Warren Alpert Medical School of Brown University, Providence, Rhode Island.
2. The Fenway Institute, Fenway Health, and Division of Infectious Diseases, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts.
3. Quest Diagnostics Nichols Institute, Department of Molecular Diagnostics, Chantilly, Virginia.
4. Rhode Island Department of Health, Providence, Rhode Island.