1. Department of Microbiology and Immunology, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA.
2. Department of Epidemiology, UNC Chapel Hill School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
3. Department of Medicine, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA.
4. Immunology/Histocompatibility and Immunogenetics Laboratories, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA.
5. Department of Pathology and Laboratory Medicine, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA.
6. Hope Clinic of the Emory Vaccine Center, Division of Infectious Diseases, Department of Medicine, School of Medicine, Emory University, Decatur, GA 30322, USA.
7. Center for Infectious Disease and Vaccine Research, Institute for Immunology (LJI), La Jolla, La Jolla, CA 92037, USA.
8. Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California, San Diego (UCSD), La Jolla, CA 92037, USA.