The most effective method that helps stop the spread of HIV infection is prevention from exposure to the virus in the first place. Obviously some members of the public are more at risk than others, but it’s not only drug addicts and sex workers who need to be concerned about HIV. This illustrated resource over at WikiHow gives you an itemised list of things that everyone can do to protect him or herself from potential HIV infection. (The pictures are safe for work, but the text may be a little explicit.)
Here is a lists of some of our other blog posts on HIV.