In a recent study it was found that an experimental vaccine provides partial protection against Simian Immunodeficiency Virus (SIV) infection in rhesus monkeys.
New vaccine research in monkeys suggests that scientists are homing in on the critical ingredients of a protective HIV vaccine and identifies new HIV vaccine candidates to test in human clinical trials. The research, which appears online in Nature on Jan. 4, was co-funded by the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health.
In the study, scientists report that several Simian Immunodeficiency Virus (SIV) prime-boost vaccine regimens have demonstrated partial protection against acquisition of infection by a virulent, tough-to-neutralize SIV strain that is different from the strain used to make the vaccinea scenario analogous to what people might encounter if an HIV vaccine were available. The experimental vaccine regimens reduced the monkeys' likelihood of becoming infected per exposure to SIV by 80 to 83 percent compared to a placebo vaccine regimen. Further, in those monkeys that did become infected, the experimental vaccine regimens substantially reduced the amount of virus in the blood compared to controls. Now plans are underway for early-stage clinical trials of a human-adapted version of one of the study's prime-boost vaccine combinations.