Easy! It was the Physician John Snow, The outbreak was called The Broad Street cholera outbreak or Golden Square outbreak, The Street is nowerdays called Broadwick Street in The Soho district in London.
Nucleoside analogs are the mutagenic chemicals that have a structure that is similar to the normal bases of the nucleotide and thus can be incorporated in the DNA during the process of replication, however as it has different base-pairing rules than the normal nucleotide base it can lead to mutations.
An example of a nucleoside analog is acyclovir which an analog of guanosine.
