The Germ Theory of Disease was developed by French chemist Louis Pasteur in the mid-1800s. He discovered that the fermentation of alcohol was caused by a microscopic organism he called bacteria. He also learned that heat killed bacteria. He developed the process of pasteurization, which kills germs in liquids. He also discovered that bacteria was the cause for many diseases. This affected the world because it provided a cause for disease, and an effective means to fight it.
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