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To be effective, a vaccine against human immunodeficiency virus type 1 (HIV-1) must induce virus-specific T-cell responses and it must be safe for use in humans. To address these issues, we developed a recombinant vaccinia virus DIs vaccine (rDIsSIVGag), which is nonreplicative in mammalian cells and expresses the full-length gag gene of simian immunodeficiency virus (SIV). Intravenous inoculation of 10(6) PFU of rDIsSIVGag in cynomologus macaques induced significant levels of gamma interferon (IFN-gamma) spot-forming cells (SFC) specific for SIV Gag. Antigen-specific lymphocyte proliferative responses were also induced and were temporally associated with the peak of IFN-gamma SFC activity in each macaque. In contrast, macaques immunized with a vector control (rDIsLacZ) showed no significant induction of antigen-specific immune responses. After challenge with a highly pathogenic simian-human immunodeficiency virus (SHIV), CD4(+) T lymphocytes were maintained in the peripheral blood and lymphoid tissues of the immunized macaques. The viral set point in plasma was also reduced in these animals, which may be related to the enhancement of virus-specific intracellular IFN-gamma(+) CD8(+) cell numbers and increased antibody titers after SHIV challenge. These results demonstrate that recombinant DIs has potential for use as an HIV/AIDS vaccine.

journal of virology

Intravenous Inoculation of Replication-DeficientRecombinant Vaccinia Virus DIs Expressing Simian ImmunodeficiencyVirus Gag Controls Highly Pathogenic Simian-HumanImmunodeficiency Virus inMonkeys