Who was instrumental in controlling the cholera epidemic in London in the 19th century?

John Snow was instrumental in controlling the cholera epidemic in London during the 19th century through his groundbreaking work in epidemiology and public health. Snow is well-known for his investigation of the 1854 cholera outbreak in the Soho district of London, where he used a methodical approach to map the cases of cholera and identify a specific contaminated public water pump as the source of the outbreak.

By advocating for the removal of the handle of the contaminated pump, he demonstrated how cholera was transmitted via contaminated water, rather than miasma or "bad air," which was the prevailing thought at that time. His actions not only led to a decrease in cholera cases but also laid the groundwork for future public health practices, including water sanitation and the importance of clean drinking water.

This significant contribution to understanding and controlling the spread of infectious diseases solidified Snow's legacy as a pioneer in epidemiology, making him a key figure in the fight against cholera in London.