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in the history of medicine.
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Tuberculosis was not feared in the same way cholera was,
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but it was unquestionably the greatest killer
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of the nineteenth century, and until 1882,
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it was shrouded in mystery.
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Suddenly Koch cast a new shaft of life,
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revealing to the world that he had unraveled
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the entire mystery of its etiology.
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Then, in 1883, he followed up this discovery
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with another that was almost equally influential.
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In 1883, he isolated the Vibrio cholerae.
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Koch then had discovered and demonstrated