Ebola: 90% mortality.
The incubation period, that is, the time interval from infection with the virus to onset of symptoms, is 2 to 21 days.
People are infectious as long as their blood and secretions contain the virus. Ebola virus was isolated from semen 61 days after onset of illness in a man who was infected in a laboratory. So while it is of most concern while it is a pulmonary disease, it can reemerge long after.
From there, it exists in a reservoir in fruit bat colonies, its most common animal vector.
Dang, I was hoping it existed in a ding bat colony so we could get rid of the dims.
This outbreak is "only" 60% mortality.