Drug-injecting addicts who took a daily antiretroviral pill were half as likely to become infected with H.I.V. as those who did not, a major new study has found, providing the final piece of evidence that such treatments can prevent AIDS in every group at risk. Earlier clinical trials showed that the therapy can sharply reduce the risk of H.I.V. transmission from mother to child, and in gay and bisexual men and heterosexuals.
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Dr. Julio Montaner, a University of British Columbia AIDS researcher who works with a large addict population in Vancouver, said the news that the therapy worked among drug users was “all very good and dandy – and a new piece to the puzzle.”