SEATTLE — The Ebola epidemic in West Africa has killed more than 10,000 people. If anything good can come from this continuing tragedy, it is that Ebola can awaken the world to a sobering fact: We are simply not prepared to deal with a global epidemic.

Of all the things that could kill more than 10 million people around the world in the coming years, by far the most likely is an epidemic. But it almost certainly won’t be Ebola. As awful as it is, Ebola spreads only through physical contact, and by the time patients can infect other people, they are already showing symptoms of the disease, which makes them relatively easy to identify.

Other diseases — flu, for example — spread through the air, and people can be infectious before they feel sick, which means that one person can infect many strangers just by going to a public place. We’ve seen it happen before, with horrific results: In 1918, the Spanish flu killed more than 30 million people. Imagine what it could do in today’s highly mobile world.

Much of the public discussion about the world’s response to Ebola has focused on whether the World Health Organization, the Centers for Disease Control and Prevention and other groups could have responded more effectively. These are worthwhile questions, but they miss the larger point. The problem isn’t so much that the system didn’t work well enough. The problem is that we hardly have a system at all.