The Black Death
The black death is a disease the affected many people and killed many people. It affected the world population because it brought down the world's population. The Black Death was one of the most devastating pandemics in human history, resulting in the deaths of an estimated 75 to 200 million people and peaking in Europe in the years 1348-50 CE. Although there were several competing theories as to the etiology of the Black Death, analysis of DNA from victims in Northern And Southern Europe published in 2010 and 2011 indicates that the pathogen responsible was the Yersinia Pestis bacterium, probably causing several forms of plague. The Black Death is thought to have originated in the arid plains of central Asia, where it then travelled along the Silk Road, reaching the Crimea by 1346. It was most likely carried by Oriental rat fleas living on the black rats that were regular passengers on merchant ships. Spreading throughout the Mediterranean and Europe, the Black Death is Estimated to have killed 30%-60% of Europe's total population. The plague reduced the world population from an estimated 450 million down t 350-375 million in the 14th century. It took 150 years for the Europe's population to recover. The plague recurred occasionally in Europe until the 19th century.