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the people who were skeptical
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with regard to the ideas of John Snow.
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These were largely associated with the political left.
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Why?
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Anticontagionism implied free trade.
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It was associated with liberalism, and with the defense
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of individual liberties against arbitrary state bureaucracies.
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It implied opposition to extreme, and sometimes violent,
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plague measures of public health.
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So, it wasn't by coincidence that it was a good idea
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to look at a map of Germany, because the most important of
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the contagionists, Robert Koch, was an icon and promoter