A resident of the southwestern U.S. state of Arizona has died from pneumonic plague, a severe lung infection caused by the Yersinia pestis bacterium, health officials confirmed on Friday, July 11, BBC reports.

A person has died from pneumonic plague—described by the Cleveland Clinic as the "least common and most dangerous type of plague"—in northern Arizona. In a statement, Northern Arizona Healthcare said the person showed up at the Flagstaff Medical Center Emergency Department and died there on the same day they sought treatment,