1. Duke Human Vaccine Institute, Duke University School of Medicine, Durham, NC 27710, USA.
2. Department of Pathology, Duke University School of Medicine, Durham, NC 27710, USA.
3. Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA.
4. Beth Israel Deaconess Medical Center, Boston, MA 02215, USA.
5. Department of Surgery, Duke University School of Medicine, Durham, NC 27710, USA.
6. Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA.
7. Fred Hutchinson Cancer Research Center, University of Washington, Seattle, WA 98109, USA.
8. Department of Microbiology, Boston University School of Medicine, Boston, MA 02118, USA.
9. Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA.