Bubonic plague has been around for a long time. We have it today, we study the bacillus, we treat it with penicillin. We dig up old mass graves from the 14th century and we find evidence that the disease then is the same disease as today. We look at art from the 14th century and we see the buboes represented in plague victims.
Now we have a filovirus and some doctor thinks it's bubonic plague.
It ain't.
What they often do not mention was the terrible lifestyle and habits.
Also with the fall of the Roman Empire, much of Europe lost clean running water and somewhat of a sewer system (among other things)
Europe lost those things and never recovered for a millennium. All things being equal (and they are not) just those two benefits of modern society help to prevent a repeat of the middle ages living situation.
Just the fact that the stores generally sell clean meats and fruits. Without running water and a sewage system that is not possible.
Relatively unlikely it would happen today.
BP is already endemic in southwest rodents.
Somehow, we’ve all managed to survive.