Figure 2. The distribution of mean annual temperature, altitude, Maximum Green Vegetation Fraction, and population density across the African continent with the distribution of zoonotic Ebola virus disease transmission events overlaid (red/blue dots).

In the map of population density, darker shades indicate higher population density, while areas of white indicate a population density less than 10 persons per km². These maps depict the raster data distributions of the predictor variables and the observed point process of EVD spillover, rather than modeled associations.