The Black Death is a deadly plague/disease That swept through Europe between 1347&1351. It killed almost 20 million people, it could spread by the air, getting bitten by infected rats and fleas. Contagion is the passing of a disease from one person to another by direct or indirect contact. Some of the symptoms are fevers, chills, vomiting, diarrhea, aches, pains, and death. Doctors used simple techniques such as bloodletting, boil balancing, and superstitious. So many people died, there was labor shortages all over Europe.