The disease then rapidly spread to the neighboring countries of Liberia and Sierra Leone with smaller outbreaks occurring in Senegal , Nigeria , and Mali.It is the largest Ebola outbreak ever documented , and the first recorded in the region .
The disease then rapidly spread to the neighboring countries of Liberia and Sierra Leone with smaller outbreaks occurring in Senegal , Nigeria , and Mali . 
 Ebola virus epidemic is the largest Ebola outbreak ever documented , and the first recorded in the region .