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John Snow of London,a famous doctor.Cholera is a deadly disease that era.Treatment of the causes and treatment methods are alive.Each time the outbreak of hundreds of thousands of poor people have died.When the outbreak of cholera in London in 1854,when John Snow began investigating the reasons.He found that the majority of deaths occur in the 'wide street' in the vicinity of water pipes.As a result,he did further investigation and found that water pollution seems to be produced cholera causes.Him to take measures to curb cholera quickly.In the end,he proved that cholera is spread by bacteria,
And eventually defeated the cholera.
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