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Natural spirits are revengeful or dark, cause sickness.
Some cultures still believe in this idea. -
Thought sickness was due to the imbalance of natural forces or bodily fluids. 1st idea of environmental effects on health.
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Quarantine is the separation of possibly infected people in a population.
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The Bubonic Plague was caused by bacteria in fleas and rats. However, doctors during this era thought the sickness was due to Miasma, or bad air.
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People thought that "disease seeds" in the air caused sickness
-early germ theory -
Bills of Morality - analyzed death statistics and life expectancy to see if there were any trends in disease.
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Invented the first light microscope and coined the term "cells"
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"Father of Microscopy" - made the first useful microscope and was the fist to see bacteria.
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Studied Jail Fever and believed sickness was caused by filth. Coined the term "influenza"
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First clinical trial on sailors with scurvy, proposed they eat citrus fruits to prevent the sickness. Results weren't accepted for 30 years.
