Not so, Danesis. The incidents generally known as "The Black Death" and "The Great Plague" were both flea-borne. They were, most likely, the same disease: Bubonic Plague. You can also catch the infection by coughed saliva and blood droplets of victims, however (pneumonic plague).

It is bacterial, not viral.

There are a few scientists who question that the Black Death was bubonic plague, but I don't know their research well. Do you have any further knowledge on this?

BTW, interesting as your post is, it is, as we have been saying, irrelevant to "Ring around the Rosie." Just sayin'.