A rare respiratory illness known as pneumonic plague killed one Arizona resident. Know signs and symptoms and treatments to take in the event when you contract with the deadly plague bacterium.

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