1. U.S. Military HIV Research Program (USMHRP), Walter Reed Army Research Institute, Division of Retrovirology, Rockville, Maryland 20850.
2. Department of Infectious Diseases and Tropical Medicine, University of Munich, Munich, Germany.
3. USMHRP, Henry M. Jackson Foundation, Rockville, Maryland 20850.
4. Mbeya Referral Hospital, Mbeya, Tanzania.
5. Mbeya Medical Research Project, Mbeya, Tanzania.