2. History of epidemiology

2.2 From the epidemiology of surveillance…

John Snow (1813-1858) (continued)

John Snow showed that the number of deaths and mortality rates were higher among people drinking water supplied by the Southwark and Vauxhall Company than those drinking water from the Lambeth Company (see table).

The London cholera epidemic of 1854
 No. of dwellings No. of cholera deaths No. of deaths per 10,000 dwellings
Southwark and Vauxhall  Company 40,046 1,263 315
Lambeth Company 26,107 98 37
The rest of London 256,423 1,422 59