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and you see the skeleton up there pumping the water,
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got played out in cartoons.
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There was some developments later,
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more traditional medical developments,
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like more work by Pasteur on the germ theory.
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Then there was the isolation of the particular microbe;
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this happened 26 years after Snow died.
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You can see here that the public health intervention
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which was to prevent the cases from beginning in the first place,
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rather than trying to treat them,
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was very effective in this particular case.
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If you travel to London there's a John Snow Pub