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Healthy People

Inside Job

Carnivores eat their prey from the outside, author David Quammen writes in his 2012 book Spillover. Pathogens attack from within and are no less deadly. They enter our bodies unseen when we breathe, have sex, take a drink of water or just walk in the woods.

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Targeting an Old Foe

M. tuberculosis is a tenacious germ. Armored in a thick, waxy wall impervious to water, the bacterium can lie dormant in the lungs for decades, waiting for a weakness in its human host.