Mycobacterium tuberculosis is a near-perfect predator. In 1882, Robert Koch, the physician who discovered the microbe, told a room full of scientists that it caused one in seven of all deaths. In 2023, after a brief hiatus, tuberculosis regained from COVID its status as the world's deadliest infectious disease'a title it has held for most of what we know of human history. Some people die of TB when their lungs collapse or fill with fluid. For others, scarring leaves so little healthy lung tissue that breathing becomes impossible. Or the infection spreads to the brain or the spinal column, or they suffer a sudden, uncontrollable hemorrhage. Lack of appetite and extreme abdominal pain can fuel weight loss so severe that it whittles away muscle and bone. This is why TB was widely known as 'consumption' until the 20th century'it seemed to be a disease that consumed the very body, shrinking and shriveling it. On a trip to Sierra Leone in 2019, I met a boy named Henry Reider, whose mix of...
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