The HIV virus has had a devastating impact on people across the world and we still don't have a vaccine against it. But a team of London scientists are on the case, and they've got a new trick up their sleeves.
They're going to see what happens if you give people two different vaccines, instead of just one. So volunteers in a trial will be given a vaccine derived from Sendai, a hamster infection, and also another vaccine called Ad35-GRIN. Will this double-pronged attack be enough to keep HIV at bay? I'll certainly be keeping an eye on the team's progress.
This story was first published by BBC News on 30 May 2013.