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Sushruta Samhita theorized that diseases are caused by one person spending time together doing different things.
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He thought diseases were caused by bad air, this theory was accepted in Europe and China in ancient times.
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Zacharias Janssen invented the microscope, the germ theory could not have been developed without the microscope.
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Robert Hooke published Micrographia, this book was filled with drawings and descriptions of the organisms he viewed under the new microscope.
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Theodor Schwann discovers that all animals are made of cells as well. This event made many people propose the name "Cell Theory"
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Matthias Shleiden discovered that all plants are made of cells.
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Ignaz Philipp Semmelweiss discovered that simply hand washing reduces spread of childbed fever among patients in a hospital from approximately 12% to 1%, though no one believed him.
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Karl Theodor Ernst von Siebold discovered that microbes are also made of cells too, though not many cells, just one cell.
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Louis realizes the Germ Theory of Disease or pasteurization. this is the idea that infectious diseases are caused by germs, and then spread about by people.
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Robert Kosh (different from Koch) colcluded that particular microbes caused different kinds of diseases.
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Robert Koch (different from Kosh) established that particular germs cause different diseases.
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Florence Nightingale concluded that being clean was essential in patient care and reducing infectious diseases.
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Joseph Lister developed a use of chemicals to help in reducing the spreading of microbes.
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William Stewart Halsted was the very first to use gloves while performing surgery as a way to prevent the spread of microbes.
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When this year came, most of the world had approved this Theory.