Johnson presents the idea that cholera couldn’t be studied in isolation during the outbreak of 1854. The outbreak happened during a time period that lacked the resources to study cholera in isolation. Cholera couldn’t be studied in isolation because first of all the source needed to be found. Without the help of the residents on Broad Street, the source would have been incredibly hard to find. Looking at the broader patters was another aspect that couldn’t have been done in isolation. Henry Whitehead and John Snow were forced to integrate themselves into the lives of these people, so they can understand broader patterns. With these knowledge, John Snow was able to draw a map that will ultimately be the last piece of the puzzle. At last, lack
