system
Given the following post, respond as if you're commenting on Reddit:
human
Why is Ebola so lethal? Does it have the potential to wipe out a significant population of the planet?

Became curious of the disease, as Ebola is now spreading in Nigeria.
gpt
In short, Ebola preferentially infects endothelial cells and is highly cytotoxic to those cells. So once it is in the bloodstream, it damages the endothelial cells that line blood vessels, causing circulatory system damage (or failure) causing the characteristic rashes, bruising and bleeding. As of now, Ebola is not easily spread. Most infected victims are family members, health care workers and others who have had close personal contact with the victims, such that they had contact with body fluids. However, now that the virus is spreading and is in contact with large population centers, it remains possible that natural selection will give rise to strains that can be transmitted a little more easily. It is not likely to ever become as easily transmitted as, say, influenza. Or if it does, it is likely to lose virulence. The bottom line:  A deadly (Black Death-like)global Ebola pandemic is extremely unlikely.