So far 15 of the 29 monkeys have been completely protected from SIV infection. The effect appears to last; the last challenge was three years after infection and vaccinated monkeys’ immune system shows ability to suppress viral reproduction four years after vaccination.
Because of advances in treatment, AIDS is a relic of the last century in many people’s minds. This is some of the good news. HIV is treatable, and full-blown AIDS is increasingly uncommon, but that is only part of the story.