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Which factor do you think was the most important for improving public health? The improved public health came about as a result of the work of key individuals, as well as smaller factors in the period in question. Louis Pasteur wanted to find a different cause of disease, as the current 1800 theory was that miasma, or bad air caused illness. With the help of Lister's powerful microscope invention, Pasteur was able to delve deeper into things you couldn't see with the naked eye; organisms. He made the theory that these germs caused disease, based on his evidence that bacteria caused decay, when he worked for a brewery. Pasteur, however, was able to prove his theory; it was Robert Koch who later proved that. It was due to Pasteur, and his theory that people could now scientifically prove John Snow's theory. John Snow was a man who carried out meticulous research on...

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