I would guess then that an outbreak of this sort is a testament to extremely squalid living conditions in the areas affected.
It's very difficult to convince people to not eat food when the alternative is starving.
Chance of sickness or certainty of starvation.
Stuff like this:
http://magazine.jhsph.edu/2006/Spring/africa/news/virus_hunt...
This one is more focused on conservation:
I expect there is lots more.