Researchers at Oregon Health and Science University have made some serious progress in coming up with a vaccine that could prevent AIDS. The vaccine in development is being tested on primates infected with simian immunodeficiency virus, or SIV. The virus is the primate equivalent of HIV and similarly causes AIDS. When tested on primates, the OHSU vaccines appears to have completely killed SIV in many cases. The results were published on Wednesday by the journal Nature. “This latest research suggests that certain immune responses elicited by a new vaccine may also have the ability to completely remove HIV from the body,” said Dr. Louis Picker, the associate director of OHSU’s Vaccine and Gene Therapy Institute.