Before revision: Examples of focuses of infection Water pump in 1854 London This pump on Broadwick Street is a monument to public health intervention In 1854 London physician John Snow discovered that people who drank from a particular water pump contracted cholera, and proposed that drinking this water from this pump was the cause of the illness.
After revision: Examples of foci of infection Water pump in 1854 London This pump on Broadwick Street is a monument to public health intervention In 1854 London physician John Snow discovered that people who drank from a particular water pump contracted cholera, and proposed that drinking this water from this pump was the cause of the illness.