A problem seems to be that the desire to eat bush meat (monkeys, bats, whatever) is strong despite the risks. As long as the practice continues it's unlikely you'll prevent the disease at its source. Countries such as ours can try to push education of the causes of the disease and attempt to influence some change, but until that happens our only option to prevent spread overseas is to limit travel and tighten security at borders. And of course continue with efforts to create a vaccine.