For patients with a history of no or minimal (one or two nucleotide reverse transcriptase inhibitor (NRTI) drugs) prior antiretroviral therapy: CD4+ cell count greater than or equal to 400 cells/mm(3) and HIV viral load less than 50 copies/mL, with no recorded HIV viral load obtained after acute HIV infection greater than 2,500 copies/mL. For patients currently receiving antiretroviral therapy: no antiretroviral therapy for a period of at least 7 years prior to starting antiretroviral therapy, with CD4+ cell count greater than or equal to 400 cells/mm(3) and HIV viral load < 50 copies/mL at the time of initiation of antiretroviral therapy, and no recorded HIV viral load obtained after acute HIV infection > 2,500 copies/mL. HIV viral loads obtained during acute HIV infection (within 6 months of the estimated date of seroconversion) will not be utilized for study inclusion/exclusion.