The disease is rarely found in humans, so much so that only seven people are diagnosed with the severe lung infection annually in the United States.

A person in Arizona recently died of pneumonic plague—a rare and severe form of the disease. An expert explains how the ...

The first pneumonic plague death in Arizona's Coconino County in almost two decades highlights the rare but deadly ...

Pneumonic plague is a form of plague that results from Yersinia pestis infection. This article explores its causes, symptoms, and treatment in more detail.

Fear not, for the CDC also states that "Plague is infamous for killing millions of people in Europe during the Middle Ages.

A resident of Northern Arizona recently died after being infected with the pneumonic plague, the first death in the US since 2007.

Pneumonic plague is the most deadly and easiest to spread, with a nearly 100% fatality rate untreated, said Lisa Morici, a microbiologist and immunologist at the Tulane University School of Medicine.

Pneumonic plague can also occur when the bacteria from untreated bubonic or septicemic plague spreads to the lungs. Septicemic plague doesn’t spread from person to person.

The pneumonic plague is often deadly and can be transmitted from person to person. However, Dr. Fawcett says it's not clear if that happened.

What Is Plague? There are three forms of plague in humans: bubonic, septicemic and pneumonic, with bubonic having the lowest risk of death and pneumonic the highest.