Additional Study Information: Antibodies are one of the natural ways that our bodies fight or prevent infection. We're testing an antibody to find out if it's safe, if they don't make people feel uncomfortable, how these study antibodies move throughout the body, and to measure antiviral activity. You cannot get HIV from the study antibody. First, request to be contacted by our study team. We'll follow up by asking you to complete a brief electronic prescreen questionnaire to find out if you meet basic study criteria. If you meet basic criteria, we'll invite you to our research site to review the study for which you may be eligible and possibly draw blood to find out if you meet additional medical criteria. You'll receive $75 for the screening visit. If you're eligible, consent to participate, and are assigned into Group 1, 2, or 3, you will receive IV infusions of the antibodies at 1 visit only for which you'll be compensated $200 for completing the visit. We'll also ask you to return to the research site another 10 times to complete follow up visits that require blood to be drawn for which you'll be compensated $75 for each visit. If you're eligible, consent to participate, and are assigned into Group 4, you'll receive IV infusions of the antibodies at 2 visits for which you'll be compensated $300 per visit. We'll also ask you to return to the research site another 13 times to complete follow up visits that require blood to be drawn for which you'll be compensated $75 per visit. Your participation will help end HIV by informing medical science and HIV prevention efforts.