Ongoing trials of two potential vaginal microbicides against HIV/AIDS at a hospital in Kampala have so far produced promising results, local newspaper Sunday Monitor reported. Vaginal microbicides are substances that a woman can insert before sex in order to inactivate HIV and other sexually transmitted microbes. The microbicides can work in one of three ways - by killing the virus before it enters the body, by preventing it from taking hold once inside the body, or by creating a barrier to stop it from entering the body in the first place, the report said.