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medical theory at the time
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sanctioned this particular reaction,
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or led to it logically.
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Because epidemics and humoral theory,
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as you now know,
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were caused by an imbalance in the humors,
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triggered by a poisoned air,
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one of the "Six unnaturals," A miasma.
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In other words,
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the disease was tied to the air
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around a given locality,
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and so it made perfect good sense,