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Even in ancient instances individuals are unaware from the existence of living organisms invisible towards the eye, causing disease. Hence, the ancient Greek scientist and physician Hippocrates expressed this assumption in 1 of his works. But https://www.essaystone.com/ come to grips with their study of mankind has been able only just after the Dutch optician van Leeuwenhoek in the XVI century made the initial microscope and saw firsthand the bacteria within a drop of water. Nevertheless, lots of within the class scientist denied the existence of pathogens within a handful of centuries immediately after the invention of Leeuwenhoek.