HIV antibody study sees if virus stays away after pills stop

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

* INCLUSION CRITERIA: In order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. Ability to provide informed consent; 2. Stated willingness to comply with all study procedures and availability for the duration of the study; 3. Adult persons of any sex, aged 18 years to 70; 4. Participated in Protocol MCA-1034 (NIH # 001037) and completed follow up 12 to 24 weeks prior to study entry (day 0); 5. On antiretroviral therapy with plasma HIV-1 RNA levels of less than or equal to 50 copies/ml and no reported interruption of ART for 7 consecutive days or longer for at least 48 weeks. NOTE: A single plasma HIV-1 RNA \>50 copies/mL but less than 200 copies/mL that is followed by an HIV-1 RNA \<= 50 copies/mL is permitted; 6. Current CD4+ T cell counts \>= 400 cells/mcL, CD4+ T cell % \>= 15%; 7. If on an NNRTI-based regimen, willing to switch to an integrase or protease inhibitor-based regimen for at least 4 weeks prior to discontinuing ART; 8. For participants who can become pregnant (i.e., participants who have not been post-menopausal for at least 24 consecutive months, who have had menses within the preceding 24 months, or who have not undergone surgical sterilization, specifically hysterectomy and/or bilateral oophorectomy), negative pregnancy test at screening and within 48 hours prior to entry. NOTE: Participant-reported history is acceptable as documentation of hysterectomy and bilateral oophorectomy, tubal ligation, tubal micro-inserts, and vasectomy; 9. Participants who can become pregnant must agree to use one method of contraception, from the highly effective methods for contraception listed below. Barrier methods of contraception are permitted as a method of contraception. Contraception must be used from study entry and until ART is reinitiated and viral suppression is achieved. Acceptable methods of contraception include: * Condom with spermicide * Diaphragm with spermicide * Contraceptive subdermal implant * Intrauterine device or intrauterine system * Combined estrogen and progestogen oral contraceptive * Injectable progestogen * Contraceptive vaginal ring * Percutaneous contraceptive patches Partner sterilization with documentation of azoospermia prior to the participant's entry into the study, and this partner is the sole partner for that participant, will be allowed. The documentation of partner sterility can come from the site personnel's review of medical records, medical examination and/or semen analysis, or medical history interview provided by the participant or the partner. Self-reported documentation of reproductive potential should be entered in the source documents; 10. Willingness to use barrier protection (male or female) during sexual activity during ATI and until viral re-suppression for those who re-start ART. EXCLUSION CRITERIA: Any individual who meets any of the following criteria will be excluded from participation in this study: 1. History of AIDS-defining illness and/or known CD4 nadir less than 100 cells/mcL in the last 3 years; 2. History of systemic corticosteroids (e.g. an equivalent dose of prednisone of \>20 mg daily for \>14 days), immunosuppressive anti-cancer, interleukins, systemic interferons, systemic chemotherapy or other medications considered significant by the trial physician within the last 3 months; 3. Any clinically significant acute or chronic medical condition (e.g. such as autoimmune diseases, cirrhosis, active malignancy that may require systemic chemotherapy or radiation therapy), other than HIV infection, that in the opinion of the investigator would preclude participation; 4. History of or current clinical atherosclerotic cardiovascular disease (ASCVD), as defined by 2018 ACC/AHA guidelines, including a previous diagnosis of any of the following: * Acute myocardial infarction * Acute coronary syndromes * Stable or unstable angina * Coronary or other arterial revascularization procedures * Stroke * Transient ischemic attack * Peripheral arterial disease presumed to be of atherosclerotic origin; 5. Any history of an HIV-associated malignancy, including Kaposi's sarcoma, or any type of lymphoma or virus-associated cancers; 6. Any history of Progressive Multifocal Leukoencephalopathy (PML); 7. Active or recent non-HIV-associated malignancy requiring systemic chemotherapy or surgery in the preceding 36 months or for whom such therapies are expected in the subsequent 12 months; NOTE: minor surgical removal of localized skin cancers (squamous cell carcinoma, basal cell carcinoma) is not exclusionary. 8. Hepatitis B or C infection as indicated by the presence of Hepatitis B surface antigen (HBsAg) or isolated positive HBV core antibody or hepatitis C virus RNA (HCV-RNA) in blood; NOTE: Participants with a positive test for HCV antibody and a negative test for HCV RNA are eligible; as are participants with isolated HBcAb who are receiving an ART regimen that do not include tenofovir (TAF or TDF). 9. Pregnancy or lactation; 10. Receipt of cabotegravir-LA IM or rilpivirine-LA IM within 24 months prior to study entry. 11. Documented multiclass antiretroviral drug resistance that, in the judgment of the investigator, would pose a risk of virologic failure should additional mutations develop during the study; 12. Laboratory abnormalities in the parameters listed below: * Absolute neutrophil count \<1,000 cells/mcl; * Hemoglobin \<10 gm/dL; * Platelet count \<100,000 cells/mcl; * ALT \>1.5 x ULN; * AST \>1.5 x ULN; * Total bilirubin greater than 1.5 x ULN; * eGFR \<60 mL/min/1.73m\^2; 13. Receipt of an investigational product within 12 weeks prior to study entry or expected participation in such a study during this study. 14. Participation in other studies that require frequent blood sample collection during participation in this study. 15. Active drug or alcohol use or any other pattern of behavior that, in the opinion of the investigator, would interfere with adherence to study requirements.