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A project which investigated the injecting and sexual behaviour of drug users in the North West of England revealed several social and behavioural factors strongly associated with HIV-related risk behaviour. For example, homelessness, crime, ignorance of drug-related health problems and drug use by a regular partner were associated with the sharing of injecting equipment. Other variables predicted casual sexual intercourse and intercourse without condoms. Some factors were identified that were common to both injecting and sexual risk behaviour.
Klee et al. (Sun,) studied this question.