Dr John Snow - gathering evidence

The video discusses the investigation of a Cholera outbreak using a geographical grid to map deaths and identify the Broad Street pump as the source. The investigator tracked cases to local establishments and noted the use of pump water in popular drinks like sherbet, which contributed to the spread of the disease.

What methods did the teacher use to track down Cholera cases?

Describe the connection between the drink sherbet and the Cholera cases.