Trial to Evaluate the Safety and Immunogenicity of a Modified Vaccinia Ankara (MVA)-Based Anti-Cytomegalovirus (CMV) Vaccine (Triplex®)

Inclusion Criteria: * HIV-1 infection, documented by any licensed rapid HIV test, or HIV enzyme or chemiluminescence immunoassay (E/CIA) test kit, at any time prior to study entry, and confirmed by a licensed Western blot, or a second antibody test by a method other than the initial rapid HIV and/or E/CIA, or by HIV-1 antigen, plasma HIV-1 RNA viral load. NOTE: The term "licensed" refers to a US FDA-approved kit, which is required for all IND studies. WHO (World Health Organization) and CDC (Centers for Disease Control and Prevention) guidelines mandate that confirmation of the initial test result must use a test that is different from the one used for the initial assessment. A reactive initial rapid test should be confirmed by either another type of rapid assay or an E/CIA that is based on a different antigen preparation and/or different test principle (e.g., indirect versus competitive), or a Western blot or a plasma HIV-1 RNA viral load. * Currently on continuous ART for ≥48 weeks prior to study entry. This is defined as continuous ART consisting of at least 2 nucleoside reverse transcriptase inhibitors (NRTIs) and either a protease inhibitor boosted with low dose ritonavir or with cobicistat, an integrase inhibitor, or an non-nucleoside reverse transcriptase inhibitor (NNRTI) for the 48-week period prior to study entry with no ART interruption longer than 7 consecutive days. NOTE 1: Other ART regimens may be acceptable. For a list of acceptable ART regimens, please s…