Immunologic and Virologic Parameters During Analytical Treatment Interruption Following Combination bNAb Therapy During Suppressive ART

Background: Recent studies have shown bNAbs may help remove cells that are infected with HIV (HIV reservoir) from the body and may also change how the immune system fights HIV. Objective: The purpose of this research study is to see if and when HIV levels in the blood (viral load) rise after the participant stops their HIV medication. We will also measure the highest number (peak) of the virus before each participant starts their HIV medications again. For most people treated with standard HIV medications, the HIV virus amount will increase within 2 to 4 weeks after stopping their HIV medications. This study is only open to participants who have taken part in an earlier study (MCA-1034 or NIH number 001037). In the earlier study, participants either received a combination of 3BN117-LS and 10-1074-LS (two anti-HIV monoclonal antibodies) OR received placebo (salt water). In this new study, researchers will compare the participants who received the antibodies to those who did not to see what effect the antibodies may have had on the HIV reservoir. Researchers will also look at: * side effects people may have when they stop their HIV medications. * changes in the number of blood cells carrying inactive HIV (the HIV reservoir size). * the blood cells that can clear HIV before, following temporarily stopping, and after re-starting HIV medications. * how well HIV may be controlled after a participant stops their HIV medication. Eligibility: People aged 18 to 70 years with HIV who completed protocol MCA-1034 (NIH Study 001037). Design: Participants will be screened. They will have a physical exam. They will answer questions about their health. Blood samples will be taken. Participants will stop their HIV medications for a period of time. They will have blood tests every 2 weeks and clinic visits every 4 weeks for 24 weeks to check their HIV levels and to make sure they are not having side effects. There will be strict safety rules for restarting HIV medications. S