文档介绍：UNIT 1
JOHN SNOW DEFEATS “KING CHOLERA”
John Snow was a famous doctor in London—so expert,indeed,that he attended Queen Victoria as her personal he became inspired when he thought about helping ordinary people exposed to was the deadly disease of its its cause nor its cure was many thousands of terrified people died every time there was an Snow wanted to face the challenge and solve this knew that cholera would never be controlled until its cause was found.
He became interested in two theories that possibly explained how cholera killed first suggested that cholera multiplied in the cloud of dangerous gas floated around until it found its second suggested that people absorbed this disease into their bodies with their the stomach the disease quickly attacked the body and soon the affected person died.
John Snow suspected that the second theory was correct but he needed when another outbreak hit London in 1854,he was ready to begin his the disease spread quickly through poor neighbourhoods,he began to gather two particular streets,the cholera outbreak was so severe that more than 500 people died in ten was determined to find out why.
First he marked on a map the exact places where all the dead people had gave him a valuable clue about the cause of the of the deaths were near the water pump in Broad Street(especially numbers 16,37,38 and 40).He also noticed that some houses(such as 20 and 21 Broad Street and 8 and 9 Cambridge Street) had had no had not foreseen this,so he made further discovered that these people worked in the pub at 7 Cambridge had been given free beer and so had not drunk the water from the seemed that the water was to blame.
Next,John Snow looked into the source of the water for these two found that it