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John Snow, an English physician, was known for many things. He was a leader in the development of medical hygiene, and considered one of the founders of modern epidemiology.
One of the things he was best known for was for discovering the source of the cholera outbreak in 1854.
Back at that time, there were 2 dominant theories on how disease spread: the miasma theory, and the contagion theory. John Snow was a supporter of the contagion theory.
The Miasma theory stated that disease was caused by 'bad air', while the contagion theory believed that it was instead caused by contact
MIASMA THEORYDISEASE IS CAUSED BY BAD AIR
CONTAGION THEORYDISEASE IS CAUSED BY DIRECT CONTACT
When the outbreak happened, John Snow correlated the location of the water pumps and the deaths of result to the Cholera disease, and persuaded the government that cholera was a water-borne disease.
To this day, his work is celebrated just like many others, who discovered many new things. He disproved the miasma theory, and instead justified and confirmed his own contagion theory.
John SnowFounding Father of Epidemiology(1813-1858)
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