Rate of HIV infection in intravenous drug users in the U.S. in 2009, according to the Centers for Disease Control and Prevention. That rate has fallen by half — from 18% — since the 1990s. Despite the decline, HIV-testing rates among IV-drug users are also falling, and risky behaviors such as needle sharing and unprotected sex persist. Nearly half of IV-drug users with HIV did not know they were infected. [via Reuters]

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