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Plague, was a term that was used in the Middle Ages to describe all fatal epidemic diseases, but now it is only applied to an infectious, contagious disease of rodents and humans. In humans, plague occurs in three forms: , pneumonic plague, and septicemic plague. ....

Middle of Essay
.... transferred westward by traders and Mongol armies in the 14th century. While these traders were travelling westward they followed a more northerly route through the grasslands of what is now Russia, establishing a vast infected rodent population there. In 1346 the disease reached Crimea and found its way to Europe in 1347. The outbreak in Europe was a devastating one, which resulted in more than 25 million deaths-about twenty five percent of the continent's whole population. After that the plague reappeared in many European cities until the early 18th century, when it suddenly stopped there. No explanation has ever been given for the plague's rapid di ....