摘要：Injecting drug use is a major risk factor for the acquisition and transmission of the human immunodeficiency virus (HIV) and accounts for approximately 5 to 10% of all cases of HIV infection in the world. People who inject drugs are vulnerable to infection with HIV and other blood-borne viruses, predomi- nantly as a result of the collective use of injecting equipment and, to a lesser extent, of unprotected sexual behaviour. 1 HIV infection results from one of every 125 injections with an HIV-contaminat- ed syringe, one of every 40 to 400 acts of receptive anal intercourse and one of every 2000 to 3000 acts of heterosexual intercourse.
