Determining Responses to Two Different Vaccines in HIV and HCV Infected Individuals

Inclusion Criteria for Arm A Participants: * HCV-infected * HIV-uninfected Inclusion Criteria for Arm B Participants: * HIV-infected * HCV-uninfected * CD4 count greater than or equal to 300 cells/mm3 within 60 days prior to study entry Inclusion Criteria for Arm C Participants: * HIV-infected * HCV-infected Inclusion Criteria for All Participants: * Documented hepatitis B virus (HBV) antibody status. If anti-HBV core antibody positive, documented HBV negative test within 30 days prior to study entry is required. * Willing to use acceptable forms of contraception for the duration of the study and for 24 weeks after the last vaccination Exclusion Criteria for Arm A Participants: * Concurrent or recent treatment for HCV infection (within the past three months) Exclusion Criteria for Arm B Participants: * Current, prior, or clinical need for antiretroviral therapy (within the past three months prior to study entry) * Opportunistic infection other than HCV Exclusion Criteria for Arm C Participants: * Concurrent or recent treatment for HCV infection (within the past three months) * Current, prior, or clinical need for antiretroviral therapy (within the past three months prior to study entry). More information on this criterion can be found in the protocol. * Opportunistic infection other than HCV Exclusion Criteria for All Participants: * History of exposure to hepatitis A vaccine, hepatitis B vaccine, or combined hepatitis A-hepatitis B vaccines * Immunomodulatory …