1. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
2. Department of Medicine, University of Washington, Seattle, WA 98109, USA.
3. These authors contributed equally to this work.
4. Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
5. Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
6. Duke Human Vaccine Institute, Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA.
7. Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
8. Division of Immunology and Allergy, Centre Hospitalier Universitaire Vaudois, University of Lausanne, CH-1015, Lausanne, Switzerland, and Swiss Vaccine Research Institute, 1011 Lausanne, Switzerland.
9. Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, OR 97205, USA.
10. National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.