In 1918 the Spanish flu infected 500 million human beings across the world including populations in remote pacific islands and arctic countries. It killed 10 percent of its victims or roughly 50 million people which represented 3 percent of the worlds population.
Keep in mind that the Spanish flu epidemic occurred before air travel ..
This Ebola outbreak is killing 60 percent of its victims ..
http://www.americanthinker.com/2014/08/airborne_transmission_of_ebola.html