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Louis Pasteur (December 27, 1822 – September 28, 1895) was a French microbiologist and chemist. He and also his wife, Marie, are best known for their experiments supporting the Germ theory of disease, and he is also known for his vaccinations, most notably the first vaccine against rabies. He made many discoveries in the field of chemistry, most notably the asymmetry (different shapes) of crystals. He is also well known for his way of keeping milk and wine from going sour for longer. That process is called pasteurization.
Pasteur's later work on diseases included work on chicken cholera. During this work, Pasteur noticed how a culture of the responsible bacteria had spoiled, and it failed to induce the disease in some chickens which he was infecting with the disease.
