1. Department of Pediatrics, University of Oxford, Oxford OX1 3SY, England, UK
2. Emory Vaccine Center at Yerkes National Primate Research Center and Department of Pathology and Laboratory Medicine, Emory University, Atlanta, GA 30329
3. Department of Medicine and Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL 35294
4. HIV Pathogenesis Programme, Doris Duke Medical Research Institute, University of KwaZulu-Natal, Durban 4013, South Africa
5. Partners AIDS Research Center, Massachusetts General Hospital, Boston, MA 02129
6. Zambia-Emory HIV Research Project, Lusaka, Zambia
7. International AIDS Vaccine Initiative, Core Laboratory, Chelsea and Westminster Hospital, London SW10 9NH, England, UK
8. Howard Hughes Medical Institute, Chevy Chase, MD 20815
9. Zambia Blood Transfusion Service, Lusaka, Zambia