I think that the plague is treatable - isn't it bacterial, and able to be treated with penecillin?
In modern times, several classes of antibiotics are effective in treating bubonic plague. These include the aminoglycosides streptomycin and gentamicin, the tetracyclines tetracycline and doxycycline and the fluoroquinolone ciprofloxacin. Patients with plague in the modern era usually recover completely with prompt diagnosis and treatment.
Yes, it is easily treatable, IF you are not living in caves, with rats, on the lam, away from civilization. But you have to come out of the /closet/ to get treatment.
Tetracycline