Answer:
The Black Death was an epidemic that ravaged Europe between 1347 and 1400. It was a disease spread through contact with animals (zoonosis), basically through fleas and other rat parasites (at that time, rats often coexisted with humans, thus allowing the disease to spread so quickly).
Five years later, some 25 to 50 million people were dead. One of the worst plagues in history arrived at Europe's shores in 1347. Nearly 700 years after the Black Death swept through Europe, it still haunts the world as the worst-case scenario for an epidemic.
Ten years later, The Black Death resulted in the deaths of an estimated 75-200 million people—approximately 30% of Europe's population. It spread from Central Asia on rat fleas living on the black rats that were regular passengers on merchant ships and traveled towards Europe as people fled from one area to another.
The disease originated in central Asia and was taken to the Crimea by Mongol warriors and traders. The plague then entered Europe via Italy, carried by rats on Genoese trading ships sailing from the Black Sea. The disease was caused by a bacillus bacteria and carried by fleas on rodents.
