Caption:
Map showing the spread of the Black Death in the 14th century from Asia to the Middle East, Western Europe, and North Africa. Areas of major outbreaks are indicated in white. The bubonic plague was one of the most devastating pandemics in human history, resulting in the deaths of an estimated 75 to 200 million people in Eurasia in the 14th century. The bacterium Yersinia pestis, which results in several forms of plague, is thought to have been the cause. It moved along the Silk Road (a network of trade routes) and by ship and is believed to have been carried and spread by rat fleas living on black rats.