Even in ancient occasions people are unaware from the existence of living organisms invisible for the eye, causing illness. As a result, the ancient Greek scientist and doctor Hippocrates expressed this assumption in a single of his works. But come to grips with their study of mankind has been in a position only right after the Dutch optician van Leeuwenhoek inside the XVI century created the initial microscope and saw firsthand the bacteria inside a drop of water. Nevertheless, a lot of in the class scientist denied the existence of pathogens within a number of centuries right after the invention of essaystone.com/ Leeuwenhoek.

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