Germ theory states that all contagious diseases are caused by microorganisms.This theory wqas developed by Louis Pasteur in 1857. He first discovered it while working on milk pasteurization and alcohol fermentation. He noticed that when heated there was a solid left on the inside of the tank. When put under a microscope he noticed that the solids had living organisms in them. His research lead to the stansard of operation room sterilization and the use of antiseptics during surgery.
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