Participants discontinue HIVNET 014 vaccinations upon confirmation of HIV-1 infection and are enrolled in this study. Participants undergo clinical and laboratory examinations every 3 months for the first year of follow-up and every 6 months for at least 4 years thereafter. Additionally, HIV-infected partners of HIVNET 014A participants undergo clinical and laboratory examination at enrollment, and may be asked to donate additional specimens at a later time. Study endpoints include various virologic, immunologic, and clinical parameters, such as viral load, cellular immune response, and virus phenotype and genotype.