AIDS virus said to be weakening: "What appears to be happening is that by the time HIV passes from one person to another, it has already toned down some of its most pathogenic effects in response to its host's immune system. So the virus that is passed on is less 'fit' each time. This would suggest that over several generations, HIV could become less harmful to its human hosts. However, we are still far from that point - HIV is still a life-threatening infection."
Scotland: more gay men engaged in "risky" sex.