1. HIV Immunology and Diagnostics Branch, Division of HIV/AIDS Prevention, National Center for HIV, AIDS, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
2. HIV/SIV Vaccine Trial Database, Los Alamos National Laboratory, Los Alamos, New Mexico 87545.
3. Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
4. Programme National de Lutte contre le SIDA (PNLS), Kinshasa, Democratic Republic of Congo (DRC).