Injection-drug users who visit needle-exchange programs may limit their risk of getting AIDS through sharing dirty needles, but their risky sex lives still expose them to many diseases, the Kingston Whig-Standard reported Aug. 18.

Researchers from Queen's University in Ontario, Canada studied 60 needle-exchange clients found that the vast majority still had unprotected sex, including those working as prostitutes.

Ana Johnson-Masotti, the lead researcher, said the results were preliminary and part of a broader study to determine whether needle exchanges, condom distribution and education campaigns are effective in preventing infectious diseases.