Why Don't We Have an HIV Vaccine?

After 40 years of trying, why don’t we have an HIV vaccine? Did you know that even without a vaccine, we have antiviral medication that is 99 percent effective at preventing HIV? So why isn’t that good enough? The U.S. and the world have a goal of ending HIV as a major health threat by the year 2030, but is that realistic? Lots of questions, and we’ve got some answers.