Ebola history

Nowadays, Ebola has been converted into a worldwide worry or global issue, but it isn't a current problem.

The first outbreak in humans was in 1976 in Sudan and in the Congo Republic in 1979 another Ebola outbreak appeared at the same site that the first Sudan outbreak. The next Ebola outbreak was in 1994 in Gabon, it occurred in Mékouka and other gold-mining camps deep in the rain forest, though it was considered to be yellow fever until 1995.  Among 1995 and 1997, there were three outbreaks by which 415 persons were infected in Zaire, Gabon and Russia and only 93 persons survived that illness.

But Ebola is not only a question of the 20th century, in the current century until 2012, 776 persons have died because of Ebola virus in five different countries.

Since 2013 we are living the most severe Ebola outbreak, in fact more than 12,000 persons have been infected, and more than 5,100 persons have lost their lives.

Before 2013 only 2,400 persons were infected and 1,583 died. 

In a few words, Ebola concerns Western African countries, actually we are living the hardest Ebola outbreak and there isn't any vaccine or treatment to treat this illness yet.

If  Ebola outbreak is recurrent during the history, why don't we have a vaccine?   Is it because the 90% of deaths are in Africa and they cannot pay the vaccine cost?

 http://www.businessinsider.com/every-ebola-outbreak-in-history-chart-2014-8