1. Department of Environmental Health, Boston University School of Public Health, Boston, MA, USA
2. Boston Health Care for the Homeless Program, Boston, MA, USA
3. Clinical Microbiology and Molecular Diagnostics Laboratory, Boston Medical Center, Boston, MA, USA
4. Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, MA, USA
5. Department of Medicine, Boston University School of Medicine, Boston, MA, USA