1. Research Center for AIDS and HIV Infection, Manhattan VA Medical Center,1 and
2. Departments of Pathology2 and
3. Medicine,3
4. New York University, New York, New York 10010; Unite d’Immunologie Virale, Institut Pasteur, 75724 Paris Cedex 15, France4; and
5. Hematology-Oncology Division, University of Pennsylvania, Philadelphia, Pennsylvania 191045