A very important breakthrough in medicine was the Germ Theory of Disease. It was developed by French chemist Louis Pasteur in the mid 1800s. While examining the fermentation process of alcohol, Pasteur discovered that it was caused by by microscopic organisms he called bacteria. He also learned that heat killed these bacteria and the led him to discover the pasteurization to kill germs in liquids such as Milk. soon it became clear that the bacteria caused diseases.
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