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Snow’s endeavor ,
though very exhaustive is not an experiment in strict terms as he did not
manipulate the event deliberately (Lambeth company changed its source of
collection by its own decision) Another limitation is lack of randomization.
However these limitations will not reduce the greatness of his exploitation
of a natural man made disaster to reveal the mode of transmission of cholera
even before the cholera vibrio was discovered. Thus he became a great
epidemiologist of all times. |