1. R. D. Klausner and H. Gayle are at the Bill and Melinda Gates Foundation, Seattle, WA 98102, USA.
2. A. S. Fauci is director of the National Institute of Allergy and Infectious Diseases (NIAID), NIH, Bethesda, MD 20892, USA
3. L. Corey and J. N. Wasserheit are with the HIV Vaccine Trials Network, Program in Infectious Diseases, Fred Hutchinson Cancer Research Center, and the University of Washington, Seattle, WA 98109, USA
4. L. Corey is also in the Department of Laboratory Medicine, University of Washington.
5. G. Nabel is director of the Vaccine Research Center, NIAID
6. S. Berkley is with the International AIDS Vaccine Initiative, New York, NY 10038, USA.
7. B. F. Haynes is at the Duke University School of Medicine, Durham, NC 27710, USA.
8. D. Baltimore is at the California Institute of Technology, Pasadena, CA 91125, USA.
9. C. Collins is at the AIDS Vaccine Advocacy Coalition, New York, NY 10011, USA.
10. R. G. Douglas Jr. is at the Sequella Global Tuberculosis Foundation, Rockville, MD 20850, USA.
11. J. Esparza is coordinator of the HIV Vaccine Initiative of the World Health Organization-Joint United Nations Programme on HIV/AIDS (WHO-UNAIDS), Geneva 27, Switzerland.
12. D. P. Francis is at the VaxGen, Inc., Brisbane, CA 94005, USA.
13. N. K. Ganguly is in the Indian Council of Medical Research, New Delhi 110029, India.
14. J. L. Gerberding is at the Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
15. M. I. Johnston is associate director of the Vaccine and Prevention Research Program, DAIDS.
16. M. D. Kazatchkine is at the Agence Nationale de Recherches sur le Side (ANRS), Paris 75013, France.
17. A. J. McMichael is at the MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK.
18. M. W. Makgoba is at the University of Natal, Durban 4041, South Africa.
19. G. Pantaleo is in the Division of Immunology and Allergy, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Lausanne CH-1011, Switzerland.
20. P. Piot is with UNAIDS, Geneva 27, Switzerland.
21. Y. Shao is at the National Center for AIDS/STD Control and Prevention, Beijing 100050, China.
22. E. C. Tramont is director of the Division of AIDS (DAIDS), NIAID, NIH
23. H. Varmus is at the Memorial Sloan Kettering Cancer Center, New York, NY 10021, USA.