Key points from article :
Pathogens like Ebola and Zika are unlikely to cause a global pandemic disaster.
Diseases able to change civilization likely to spread through airborne route.
Researchers started without any preconceived notions of the most likely culprit.
Likely to be contagious during the "incubation period," before symptoms show.
It would have a "low but significant" fatality rate.
1918 Spanish flu had a fatality rate of just 2.5 percent, but killed 50 million.
