QUOTE : Despite the prominence that "magic bullets" and "wonder drugs" hold in the layman's mind, most of the really decisive battles in the war against infectious disease consisted of measures to eliminate disease organisms from the environment. An example from history concerns the great outbreak of cholera in London more than one hundred years ago. A London physician, John Snow, mapped occurrence of cases and found they originated in one area, all of whose inhabitants drew their water from one pump located on Broad Street. In a swift and decisive practice of preventative medicine, Dr. Snow removed the handle from the pump. The epidemic was thereby brought under control - not by a magic pill that killed the (then unknown) organism of cholera, but by eliminating the organism from the environment.