Bacteria
Louis Pasteur believed that milk contained harmful bacteria that caused spoilage and disease when left unpasteurized. He conducted experiments to demonstrate that heating milk to a certain temperature could kill these harmful organisms and make the milk safe for consumption.
Koch developed the Koch Postulates, which, if proven, demonstrate that a given microbe causes a disease. (see related link). Girolamo Fracastoro proposed epidemic diseases are caused by transferable seed-like entities that transmit infection by direct or indirect contact. Agostino Bassi was the first person to prove that a disease was caused by a microorganism.
The Germ theory of disease, developed in the 1860s and 1870s by Louis Pasteur
Louis Pasteur was instrumental in finding vaccines for diseases. He did not have any diseases himself
Louis Pasteur died on Septeber the 28th 1895 due to heart disease.
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Louis Pasteur
Louis pasteur
Louis Pasteur was trying to reject the theory of spontaneous generation, which suggested that living organisms could arise from non-living matter. He conducted experiments to demonstrate that microorganisms come from pre-existing life, leading to the development of the germ theory of disease.
Louis Pasteur discovered that microscopic animals could live in food
The heart (caused by a stroke)
Louis Pasteur.