Since 1900 there have been several mild outbreaks of bubonic plague.
Bubonic plague, to be sure, is a disease.
The word " plague " - or " pest," which is the name used in other languages - had originally a general meaning, and may have required qualifications when applied to this particular fever; but it has now become a specific label, and the prefix "bubonic" should be dropped.
The disease, on which the 14th century bestowed this name, was the bubonic plague, still familiar in the East.
The bubonic plague was brought to London by rats on board trading ships.