>>For quite a while we have thought of it as a conquered disease

Yes. And there are even cheaper and simpler options that don't bear mention. The worst ones are not the most fatal, they're the ones that only severely incapacitate because that overwhelms medical systems so they can no longer cope with other causes of preventable death. That's what causes the panic. We're talking about a delivery weapon whose cost could be as little as 250K per deployment if you know what you're doing. Somebody who knows how to aerosolize the agent can increase the danger even more. Since there is no defense (least of all a nuke) the best option is to reduce the motivation to do it to you. But we've had that discussion before.