Doctors and veterinarians in the southwestern United States should keep an eye out for cases of plague, according to a new report from the Centers for Disease Control and Prevention.
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During the summer of 2014, four people in Colorado became ill with pneumonic plague, in the United States’ largest outbreak of the illness since 1924. Pneumonic plague is a very rare disease caused by the same type of bacteria as the bubonic plague, which is perhaps best known for causing the Black Death in Europe during the Middle Ages. In people with pneumonic plague, the bacteria infect the respiratory system.