For a week or more recently, I hunted for new statistics on the Ebola outbreak, but the official death toll was stuck in the 800 range, despite hints that the reporting system had broken down. It now
looks as though the infections and deaths were indeed piling up silently. Reported deaths are now over 1,400. WHO now admits that the outbreak has spread to the
Congo, after initial denials. The
Ivory Coast has closed its borders.
Ebola remains a relatively difficult disease to transmit, or we wouldn't be seeing deaths in the 2,000 range six months into an epidemic in countries with almost no institutions capable of slowing its spread: we'd be seeing millions. The 1918 influenza spread worldwide in a few months and killed something like 50 or 100 million people (the world was in such a mess, and reporting systems so rudimentary, that it's hard to be sure). Now, the flu: there's a virus that knows how to spread. It's contagious before symptoms occur, for instance, which is not the rule with Ebola.
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.