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Koch's microscopy had a number of immediate implications.
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His staining raised the idea that if you could stain,
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you could also have an idea of magic bullets,
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what later became antibiotics.
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But Koch didn't pursue that particular interest.
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The other was this led to reliable differential diagnosis,
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and therefore
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a more properly based nosology.
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It could lead also to major public health measures,
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and ultimately to developments in therapeutics.
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It furthered the sanitary idea,
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and gave it a firm,scientific basis,