<Ul> <Li> Sex education </Li> <Li> LGBT sex education </Li> <Li> Needle - exchange programmes </Li> <Li> Safe injection sites </Li> <Li> Safe sex </Li> <Li> Serosorting </Li> <Li> Sexual abstinence </Li> <Li> Immigration regulation </Li> </Ul> <Li> LGBT sex education </Li> <Li> Needle - exchange programmes </Li> <Li> Safe injection sites </Li>

Explain in brief one measure for the prevention of aids