Your body has 10 trillion cells, but only 1 trillion of those are your own. The rest comprise the microbe ecosystem inside you, and there is much scientists don't yet understand about this complex aspect of human health. What is clear is that the body's microflora provides a powerful tool for understanding, and in some cases treating, disease. Fecal transplants for treatment of Clostridium difficile infection, a process that involves introducing microbes from one person's stool to the GI tract of another, are one way doctors are harnessing the benefits of bacteria.
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