1. L. E. Soto-Ramirez, B. Renjifo, M. F. McLane, R. Marlink, P. Auewarakul, V. Peña Cruz, D.-S. Chui, T.-H. Lee, M. Essex, Harvard AIDS Institute, 665 Huntington Avenue, Boston, MA 02115, USA.
2. C. O'Hara, Mallory Institute of Pathology, 784 Massachusetts Avenue, Boston, MA 02118, USA.
3. R. Sutthent and C. Wasi, Department of Microbiology, Faculty of Medicine at Siriraj Hospital, Mahidol University, 2 Prannok Road, Bangkoknoi, Bangkok 10700, Thailand.
4. P. Vithayasai, V. Vithayasai, C. Apichartpiyakul, Department of Microbiology, Faculty of Medicine, Chiang-Mai University, Chiang-Mai 50002, Thailand.
5. R. Osathanondh, Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Boston, MA 02115, USA.
6. K. Mayer, Research Department, Fenway Community Health Center, Boston, MA 02115, USA, Division of Infectious Diseases, Department of Medicine, Memorial Hospital of Rhode Island, Pawtucket, RI 02860, USA, and Brown University School of Medicine, Providence, RI 02912, USA.