- In order to stop Ebola in the future, scientists are looking for its host species
- It can spread from animals to humans
- Searches so far have focused on forested parts of Africa
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(CNN)There was a certain kind of quiet hopefulness when, in late April this year, the last Ebola patient of the West African epidemic -- a two-year-old boy -- walked out of a treatment facility in Monrovia, Liberia. With the smoldering embers of the outbreak fading, there was cause for celebration. But there remains the impotent fear of the unseen: Ebola is still out there, lurking. We just don't know where it's hiding or when it will be back.