1. Project RETRO-CI, Abidjan, Côte d'Ivoire.
2. Division of HIV/AIDS Prevention, National Center for STD, HIV, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
3. Pediatric Unit, University Teaching Hospital of Yopougon, Côte d'Ivoire.
4. Infectious Disease Unit, University Teaching Hospital of Treichville, Côte d'Ivoire.
5. Global AIDS Program, Center for STD, HIV, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
6. Global AIDS Program, International Laboratory Branch, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.