Ebola continues to shift, but grows no more fatal
Studies reveal four genetic lineages in outbreak
![Ebola map](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/06/ss_ebola-map_feat_free.png?fit=860%2C459&ssl=1)
VIRAL VARIABILITY As Ebola spread from Guinea to Sierra Leone and Liberia, the virus evolved, but didn’t become deadlier. Regions in darker shades indicate a greater number of infections.
M. Carroll et al/Nature 2015