Drug-injecting addicts who took an antiretroviral pill were half as likely to become infected with H.I.V. as those who did not, completing a body of evidence that such treatments can prevent AIDS in every group at risk.
It was long assumed that pre-exposure prophylaxis did not work for drug addicts because of the rate with which HIV spread in these populations in the 1980s. Studies have since focused on other risk groups like sexual partners and children. A new study conducted in Thailand has shown that pre-exposure prophylaxis does work in the high risk drug addiction group.
This is a great study that offers us another targeted area where we can curb HIV infection. However, the challenge will be to promote and sustain therapy and follow up in this highly transient population.