Using genomics to track the global spread of cholera

In this video, Daryl Domman discusses his research with Josie. Daryl is a researcher studying the evolution and transmission of cholera. In this video, we will learn how Daryl uses whole genome sequences in his research, and what this has enabled him to find out about how cholera has spread across the globe in recent decades.

In Comments, can you give an example of how Daryl uses genome sequencing to help identify and track the global spread of cholera?
Why is this helpful? Can you give any examples of the use of genome sequencing to track disease in your country?