Post Analytic Treatment Interruption Study

Inclusion Criteria: * Man or woman aged ≥18 years. * Enrolled in RV254 study. * Completed clinical research protocol that included ATI within one month of enrollment in this protocol. * Able and willing to provide written informed consent or, in the case of illiteracy, witnessed verbal informed consent with documentation of a thumbprint in lieu of a signature. * Able to participate in study visits for up to 144 weeks. * Willing to have photo or fingerprint taken for identification purposes. * Female-specific criteria: Agrees not to become pregnant while not receiving ART. If a woman is sexually active and has no history of hysterectomy or tubal ligation or menopause, she must agree to engage in abstinence, use a prescription birth control method or use a barrier birth control method while not receiving ART. Exclusion Criteria: * History of a medical or psychiatric condition that, in the opinion of investigator, would jeopardize the safety or rights of the subject, such as a condition that would interfere with or serve as a contraindication to adherence to the study protocol or ability to give informed consent.