NEET BIOLOGY

Detailed explanation-1: -In 1854, Dr. John Snow used the power of mapping to identify the source of a cholera outbreak in London. The map he created based on the locations of deaths due to cholera allowed him to see a clear pattern that no one had noticed yet and ultimately determine the source of the outbreak.

Detailed explanation-2: -His pioneering medical research paid off. By using a geographical grid to chart deaths from the outbreak and investigating each case to determine access to the pump water, Snow developed what he considered positive proof the pump was the source of the epidemic.

Detailed explanation-3: -Dr. John Snow is regarded as one of the founding fathers of modern epidemiology. During a major cholera epidemic in 1854 London, he collected and mapped data on the locations (street addresses) where cholera deaths occurred. His process was laborious and slow, but ultimately very informative.

Detailed explanation-4: -In 1854 John Snow investigated the Broad Street water pump, around which a massive cholera epidemic had broken out. He removed the water pump and the cholera outbreak died away almost immediately. It proved to him that it was spread through the water supply.

Detailed explanation-5: -Snow’s hypothesis was that cholera was a waterborne disease and the source of the epidemic was a pump somewhere in the city. Except for the very wealthy, most Londoners during this time period obtained their water for drinking, washing, and food preparation from a town pump closest to where they lived.