The Black death

During the Middle Ages, the diseases they spread very fast because there were not advances in medical we have in today's society. Human beings could only rely on their immune system to defend the attack of viruses and bacteria. The Black Death began in 1348 and ending in 1400 The Black Death had three forms: bubonic plague, pneumonic plague, and septicemic plague. Bubonic plague was characterized by swelling of the lymph nodes along the neck, armpits, and groin. These symptoms were accompanied by fever, chills, joint pain, headaches, etc.. The pneumonic plague was the most common form of the disease was transmitted from person to person, an infection transmitted in the air. Symptoms included blood stained sputum. septicemic plague this  form of the disease have a mortality rate of almost one hundred percent. The septicemic plague was characterized by deep purple discoloration of the skin and extremely high fevers. The Black Death caused many deaths in Europe some 25 million people died from this disease. Some villages were completely depopulated with the few survivors fleeing and spreading the disease further.

The great population loss brought economic changes based on increased social mobility as depopulation eroded the peasants' obligations to remain on their traditional lands. The sudden scarcity of cheap labor provided a strong incentive for innovation that helped bring about the end of the Middle Ages.