Ebola kills just over half of the people who contract it, in horrific conditions. We have no information to speak of on what percentage of people it kills in a modern hospital capable of delivering good supportive care while the body mounts its own immune response. As infected Europeans come home for decent treatment, though, we may be about to find out.
Like many of the diseases that have intruded themselves on human attention, including HIV, influenza, West Nile virus, bubonic plague, Lyme disease, and salmonella, Ebola is an example of zoonosis, meaning that it has an animal reservoir and occasionally spills over into the human race. The current thinking appears to be that Ebola, like rabies, Chunkunguya, influenza A, SARS, Hendra virus, and Nipah virus, may have its reservoir in bats. Bats make a good reservoir for human disease. They resemble humans in several important respects: they're long-lived mammals, they cover long distances on the wing, and they live in huge communities capable of sustaining an infectious disease. Bats are lovely creatures that serve their neighbors well by eating lots of insects, but it's a really terrible idea to go into a bat-cave, especially in Africa.
Lately it's a bad idea to go anywhere in Africa. Ebola is the least of their worries.


