With epidemics, there are different scales of mapping. The cases happen to individuals, but the outbreak happens at regional and national scales. you can see mapping at this scale in the Esri Story Map of Ebola Outbreaks from 1976-2014.
But Esri's Hugh Keegan worked with the UN WHO to map Ebola but was given street addresses of cases. He gave a great talk at Harvard last year about the problems he faced.