Most people don’t need to be concerned about the plague based on a recent death in Arizona. But take precautions if you live in areas where the plague has been found.

Bubonic plague has a case-fatality ratio of 30% to 60% when left untreated, while pneumonic plague, when left untreated, is always fatal, according to WHO.

How Bubonic Plague Has Helped Russia Fight the Coronavirus A network of health centers formed by the Soviet Union in the 1920s is providing expertise in quarantines and epidemic response for Covid-19.