John Snows work with cholera began in 1848 during the second epidemic. The popular theory of the time was the cholera was spread by the air. John snow believed that the disease was spread by water contaminated with fecal matter. In 1854 snow used his theory to locate the source of an outbreak in the SoHo area of London.
John Snows work with cholera began in 1848 during the second epidemic. The popular theory of the time was the cholera was spread by the air. John snow believed that the disease was spread by water contaminated with fecal matter. In 1854 snow used his theory to locate the source of an outbreak in the SoHo area of London.