Not sure. Your info source may be better than mine (BBC Podcast I think?).
I was just calling attention to the fact that the #Black_Death comes in more than one form... and for a lab accident "pneumonic" implies a failure of basic respiratory precautions (ie, wearing a #mask, ventilation, etc.).
As far as I know... correctly diagnosed #Plague is treatable with antibiotics. Therefor, if that person died of Plague then it is also a failure of whatever healthcare system was treating them.
There are small outbreaks of Plague in the SW #USA periodically because it is endemic in the local rodent/flea populations.