1. U.S. Naval Medical Research Center Detachment (NMRCD), Lima, Peru APO AA 3403-3800
2. Henry M. Jackson Foundation, Rockville, Maryland 20850
3. National Institute of Hygiene, Guayaquil, Ecuador
4. Laboratorio de Investigaciones Clínicas, Hospital Vozandes, Quito, Ecuador
5. U.S. Naval Health Research Center, San Diego, California 92186-5122
6. Division of Retrovirology, Walter Reed Army Institute of Research, Silver Spring, Maryland 20910