Louis Pasteur

Louis Pasteur

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Caption: Louis Pasteur (1822-1895), the French chemist and microbiologist, in 1857, the year he published his theory of fermentation. This stated that fermentation is caused by micro-organisms. He introduced pasteurization, subjecting milk, wine or food to a short burst of heat, to kill these organisms. Pasteur went on to develop the germ theory of disease. In 1879, he found that an old culture of the bacteria causing chicken cholera did not cause the disease in chickens, but protected them from infection by a fresh culture. He developed a vaccine against rabies, which led to the founding of the Pasteur Institute. He also created a vaccine against the anthrax bacterium.

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