. . . Researchers followed 3000 people in 10 countries over 2 years who were living with HIV and also likely had latent TB, a bacterial infection that can be cleared with proper treatment. Instead of subjecting them all to a recommended prevention strategy—a 9-month course of the drug isoniazid—they treated half with the 9-month course and half with a monthlong combination of isoniazid and rifapentine . . . 

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