AIDS--risk behaviours and AIDS knowledge in intravenous drug users.

Surveys of intravenous drug users were undertaken in July 1985 and one year later to assess behaviours which could result in risk of HIV infection and transmission. Ready availability of sterile syringes was reported by 48% in 1986 and 63% in 1985. Sharing of syringes amongst intravenous drug users is a common practice. In 1986, 22% of subjects reported no sharing of syringes, 16% sharing with one and 62% with between 2 and 20 others. There was a significant trend towards less sharing, and improved sterilisation of syringes in 1986. Nearly all subjects were aware of the risks of HIV transmission via shared syringes. In 1985, 19% of subjects reported adopting safer-sex practices compared with 28% in 1986. A history of prostitution was reported by 50% of women. All subjects were aware intravenous drug users had been asked not to donate blood, and none reported having done so within five years. All the subjects tested for HIV antibody were negative.