1. Infectious Diseases Division, University of Pennsylvania, Philadelphia, Pennsylvania 19104.
2. Treatment Research Program, Division of AIDS, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland 20892.
3. SDAC, Harvard School of Public Health, Boston, Massachusetts 02115.
4. Northwestern University, Chicago, Illinois 60611.
5. Beth Israel Medical Center, New York, New York 10038.
6. Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, Oregon 97331.
7. Department of Pathology, Keck School of Medicine, University of Southern California, Children's Hospital, Los Angeles, California 90027.
8. Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon 97005.
9. Case Western Reserve University, Cleveland, Ohio 44106.
10. Current address: Infectious Diseases Division, UMDNJ—New Jersey Medical School, Newark, New Jersey 07103.
11. AACTG Operations Center, Silver Spring, Maryland 20910.
12. Ohio State University Hospitals, Columbus, Ohio 43210.
13. University of Texas Southwestern Medical School, Dallas, Texas 75390.