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  1. Health & Medicine

    One more reason to worry

    A single dose of the AIDS drug nevirapine, given to mothers to help prevent them from infecting their children during birth, may be enough to prod the virus to develop drug resistance.

    By Damaris Christensen
  2. Health & Medicine

    HIV may date back to the 1930s

    Genetic analysis of the AIDS virus suggests it first infected humans in the first third of the 20th century.

    By Damaris Christensen
  3. Health & Medicine

    AIDS drugs may cause bone loss

    Using X rays to measure bone density in HIV-infected men, researchers find a possible link between bone loss and long-term use of protease inhibitors.