Why is Ebola is so hard to eradicate?

Answer 1

Did you know that our knowledge about Ebola virus is very scarce?

For instance, currently it is believed that African fruit bats are likely to be reservoir host of Ebola virus, but it is still not conclusive. 

Ebola Virus Disease is an important local public health threat in Africa, with a possibility of a worldwide spread and misuse for biological terrorism. Ebola Virus Disease is a rare disease with extremely high case-fatality rate (up to 90% in man) with no treatment available.

Ebola virus can be spread from human to human through blood or body fluids (urine, saliva, sweat, feces, vomit, breast milk, and semen) or objects (such as needles and syringes) contaminated with body fluids from a sick person.

Virus also may spread from animal to human through the handling and consumption of bushmeat (wild animals hunted for food) including infected fruit bats or nonhuman primates (such as apes and monkeys).

After a person infected with Ebola develops symptoms of illness, they can spread Ebola to others. The virus can remain in certain bodily fluids of a patient who has recovered from Ebola Virus, even if they no longer have symptoms of severe illness or died.  

It is caused by at least four species of virus in humans. Vaccines that have shown promise so far have been tested only in experimental studies. There is currently no vaccine licensed by the U.S. Food and Drug Administration (FDA) to protect people from Ebola virus.

https://www.cdc.gov/vhf/ebola/index.html