Here are a few links to information about the history and geography of yellow fever.
One of the famous early investigators of Yellow Fever was Valentine Seaman, a surgeon at New York Hospital. In 1798, he published a map to support his argument that the city’s Yellow Fever outbreak was due to the smell that arose from the city’s garbage and sewage that had accumulated in the harbor area (Koch, 2005). His mapping long predated the mapping of John Snow.
More about Valentine Seaman