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A rapid DNA-based diagnostic test for tuberculosis could help health workers in poor countries detect drug-resistant forms of the infection much earlier, making it easier to treat. The World Health Organization, the U.S. government, and donor groups such as the Gates Foundation are now helping these countries acquire the technology, which was developed by a team of academic, industry, and nonprofit researchers. "It's completely changing the way people think about how to diagnose TB," says Madhukar Pai a tuberculosis researcher at McGill University in Montreal.

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