1. Department of Microbiology and Immunology, Center for AIDS Research, and Children’s Research Institute, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
2. Duke Human Vaccine Institute, Duke University Medical Center, Durham, North Carolina, USA
3. Department of Microbiology, Immunology, and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA
4. Department of Biostatistics, Gillings School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
5. Department of Surgery, Duke University School of Medicine, Durham, North Carolina, USA
6. Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
7. California National Primate Research Center, University of California at Davis, Davis, California, USA