1. Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
2. University Program in Genetics and Genomics, Duke University, Durham, North Carolina, USA
3. Department of Immunology, Duke University Medical Center, Durham, North Carolina, USA
4. Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts, USA
5. Department of Microbiology and Molecular Genetics, College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan, USA
6. Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina, USA