Even in ancient instances people are unaware from the existence of living organisms invisible to the eye, causing illness. As a result, the ancient Greek scientist and physician Hippocrates expressed this assumption in 1 of his functions. But come to grips with their study of mankind has been capable only following the Dutch optician van Leeuwenhoek in the XVI century made essay stone com the first microscope and saw firsthand the bacteria within a drop of water. On the other hand, a number of inside the class scientist denied the existence of pathogens within just a few centuries right after the invention of Leeuwenhoek.

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