The term plague was then used for a disease that was widespread.They could classify the Black Death under pandemic of a disease called plague.
Each spring, the plague attacked again, killing new victims.
After five years twenty-five million people were dead one-third of European people (Encarta).
This plague was an infectious fever caused by a bacillus with scientific name Pasteurella pestis (Shrewsbury 15).
The Black Death was one of the most devastating pandemics in human history.
In fact, the origin of plagues is not clearly identified but the most likely region of the origin of the plague was China or the nearby territory.
The plague spread from China westward via the Silk Road.In the course of time, the plague reached Crimea and Constantinople.The latter was one of the major trade centers between the West and the East.In October of 1347, several Italian merchant's ships returned from a trip to the Black Sea, one of the key links in trade with A terrible killer was loose across Europe, and Medieval medicine had nothing to combat it.In the winter, the disease seemed to disappear, but only because fleas, which were now helping to carry it from person to person, were soon dormanting then.As a result, Constantinople became the place, where merchants and travelers from Europe and Asia as well as Africa came across.Goods from the East moved to Europe through Constantinople mainly and so did the plague.The disease spread fast and covered the territory from China to England and the ultimate western part of Europe, covering almost entire Europe within several years.The disease was a true mystery for Medieval people, whereas the medicine was under-developed to cope with such a disease as the Black Death, which was presumably a plague.In such a way, the Black Death affected the demographic situation in Europe and other countries of the world, changed socioeconomic relations and provoked re-consideration of basic values and beliefs of people living in that time.The emergence of the Black Death in Europe was associated with the spread of the pandemic from the East.