Once the disease becomes active, its course is extremely unpredictable. For reasons we don’t fully understand, some patients will recover without treatment. Some will survive for decades but with permanent disability, including lung problems, devastating fatigue, and painful bone deformities. But if left untreated, most people who develop active TB will eventually die of the disease. Their lungs collapse or fill with fluid. Scarring leaves so little healthy lung tissue that breathing becomes impossible. The infection spreads to the brain or spinal column. Or they suffer a sudden,
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