"Ebola is not a stranger to West Africa—an outbreak in the 1990s killed
chimpanzees and sickened one researcher. But the species
of virus that has so far killed more than 100
people in Guinea has only been seen before in Central Africa. Scientists
are
combing the forests, and the genome of the virus
itself, looking for clues to how this strain ended up so far west, and
whether
its spread suggests people in forested areas all
across sub-Saharan Africa are at risk."
http://www.sciencemag.org/content/344/6180/140.short
