HIV-prevention pill's success rekindles AIDS researchers' optimism

Truvada, a daily pill containing two anti-HIV drugs, may cut the risk of infection in gay men by more than 70%. While new studies examine its effectiveness in other groups, its high cost looms as the next big challenge.Tuesday's announcement that a once-daily pill containing two anti- HIV drugs could reduce the risk of infection by more than 70% in gay men stirred great excitement in the AIDS-prevention world because most previous efforts have failed so abysmally.

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