The study will remain open to accrual for the duration of MTN funding, and will use two follow-up visit schedules, one based on the date of diagnosis in the parent study, and one based on the initiation of antiretroviral treatment (ART). Participants who have not initiated ART at the time of enrollment in this study will follow the schedule based on the date of diagnosis. Participants who have already begun ART at the time of enrollment will follow the schedule based on the date of ART initiation. Individuals enrolled with a starting date based on the date of ART initiation will have their first follow-up visit at Week 2 before resuming the rest of the schedule. On both schedules, follow-up visits occur at Months 1, 3, and 6 and every 6 months thereafter. Interim visits may be performed at any time during follow-up, and participants will be asked to attend a final study visit prior to their termination from the study. Participants may enroll any time after their HIV diagnosis and can leave the study at any time.