There are a number of effective interventions to prevent gender-based violence among adult women and men at risk of HIV infection. But little is known about the effectiveness of these in young people.
Vikings may have helped turn around Ireland's declining population.
The government needs to revise national guidelines to better target PrEP at those that would most benefit from it.
In many parts of sub-Saharan Africa men who have sex with men encounter stigma and prejudice when accessing health services.