How threatened are we by Ebola virus?

By Peter C. Doherty
The Ebola outbreak affecting Guinea, Sierra Leone, Nigeria and now Liberia is the worst since this disease was first discovered more than 30 years back. Between 1976 and 2013 there were less than 1,000 known infections. According to the Centers for Disease Control and prevention (CDC), March to 23 July 2014 saw 1201 likely cases and 672 deaths.