Figure 1: The size (a) and case fatality rate (b) of the 22 previous Ebola outbreaks (suspected and confirmed cases).
From: A comprehensive database of the geographic spread of past human Ebola outbreaks

Circle area is proportional to the total number of reported cases (a) or deaths (b) for each outbreak. Circle colour represents different species of Ebolavirus. Black dotted lines in (b) show the median and upper and lower 75% quantiles of outbreak case fatality rate.