Colorado health officials have confirmed a human case of the plague, the rare bacterial infection infamously known for killing tens of millions in 14th century Europe. Today, it's easily treated with ...

A volcanic eruption may have triggered a deadly chain of events that brought the Black Plague to Europe in the 14th century.

Plague, one of the deadliest bacterial infections in human history, caused an estimated 50 million deaths in Europe during the Middle Ages when it was known as the Black Death.Video above: How did ...

A disease that killed 50 million people in the Middle Ages has been found in Colorado. A person in Pueblo County, Colorado, approximately 100 miles south of Denver, has been infected with the bubonic ...