摘要： Background introduction to John Snow John Snow was born and worked as a doctor in Great Britain. He was originally an anesthetist.He was so famous that he became the doctor for Queen Victoria at the births of her many children. Four outbreaks of cholera in the 1830s and 1840s killed many people in England. In 1854, the most terrible outbreak of cholera which ever occurred in the kingdom began. It was so violent and sudden that 127people died in the first three days.

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