Pneumonic plague is both “the least common and most dangerous type of plague,” according to the Cleveland Clinic.

A resident of northern Arizona has died from pneumonic plague, health officials said Friday. Plague is rare to humans, with on average about seven cases reported annually in the U.S., most of them in the western states, according to federal health officials.

A person in northern Arizona has died from a case of bubonic plague, local health officials said. The unidentified patient showed up to the Flagstaff Medical Center Emergency Department and died there the same day,