In addition to the infusion visits, participants will attend study visits at Weeks 4, 8 + 5 days, 12, 20, 28, 36, 44, 52, 60, 68, 76, 80, 88, 96, and 104. All study visits will include blood collection and HIV testing and counseling. Select study visits will include a medical history review, physical exam, urine collection, pregnancy testing for participants capable of becoming pregnant, risk reduction counseling, and an interview/questionnaire.