1. HIV Immunology and Diagnostics B ranch, Division of AIDS, STD, and TB Laboratory Research, NCID, Atlanta, Georgia 30333
2. Departments of Medicine and Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294
3. Laboratoire de Sante Hygiene Mobile, Yaoundé, Cameroon
4. Division of Microbiology, Institute of Tropical Medicine, Antwerp, Belgium
5. HIV Immunology and Diagnostics Branch, Division of AIDS, STD, and TB Laboratory Research, NCID, Atlanta, Georgia 30333