I think a lot of people don't realize the Black Plague is bacterial and we already have a cure for it. Most people getting anxious probably assume its like Covid and a cure would have to be developed.
Why pneumonic plague? Pneumonic plague is the form of infection that occurs when plague bacteria are inhaled in aerosolized form into the lungs, or when septicemic plague (plague in the bloodstreams) reaches the lungs. Like, for example, when a test tube breaks. Her method of infection was a pretty textbook vector for pneumonic plague. Other cases have been caused when tissue samples of infected rodents have been splayed open, for example, or when blood from an infected person splatters the respiratory tract. Plague bacteria spreads pretty poorly otherwise, which is why the main vector for bubonic plague is flea bites.
It’s bacteria, antibiotics work more generally than vaccines for viruses do.
There are of course, antibiotic resistant bacteria but we still have some exotic antibiotics in our arsenal.
If anything for a widespread bacterial plague I’d be more concerned about our ability to produce enough antibiotics rather than _if_ we could develop a cure