I've seen the "pop" claims that the epidemics in the 1300s were something else, and they don't fit.
In 2011 we found the plague
bacillus in the old mass graves from the era. Ebola spreads best by direct blood contact and is unlikely to become an urban epidemic disease, though it's a likely bioterror weapon. See http://www.Sciencedaily.Com/releases/2011/08/110829173751.Htm.