John Snow (1813-58)

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Basic Principlesof TEYL

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Major Study

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was well recieved by the medical proffession became known a 'Dr snows theory'

Looking at the 1853 - 54 cholera epedemic

Water from an overflowing sewer near Battersea

Water from Dittion - up river from London

130 per 1000 deaths

37 per 1000 deaths

Southwark Water Company

Lambeth Water Company

A Larger study (1856) by John Simon (medical officer, London) covering 500,000 south londeners showed

Even so medical establishment did not accept choler as a waterborne disease until 10 years later

Widow who had Broad water deliverd to her died at her heamstead home her neigbours did not

workforce who were provided with free beer from local brewry survived

7 workers who live outside the area of Broad street, but worked there died from the pump

Supported with anecdotal evidence

Geographical map showing water source and death correlation

Did not push forward becuase of his nature and the hold 'miasmic theory'

In 1949 published On the mode of communication of cholera

Years that followed, he became convinced that cholera was a waterborne disease

John Snow had fought a Cholera out break in Newcastle

20,000 deaths

John Snow was a GP working in Firth Street in Soho (London)

His suspicions fell on a pump in Broad Street

Snow persuade the local authorties to lock the Pump

The No. of deaths fell

During the third visitation of cholera (1845-54)

Provided the answer to "how it spread?"

John Snow (1813-58) Cholera

How did this come about? proof

1953 - 54 Cholera epidemic

John Simon

1931 - 32 Cholera epidemic