I found an abstract of at least one article from 1986 discussing the 13.4% prevalence of antibodies against Ebola in Liberia (from a rainforest area) in 2 minutes using pubmed, which is free and open for all to use. It does not link to the full text (some abstracts do link to full text), but the basic information was easily found. You just have to look for it!

http://www.ncbi.nlm.nih.gov/pubmed/3092415