In the 14th century, black plague occurred in 1300 years, and black plague occurred many times. For example, in the 13th century, one third of the population was killed as a result of occurrence in China. Several dates prior to this indicate that this disease occurred in Europe many years ago. Author Joe Dan Kemalin emphasizes that "every plague occurs and the sorrow of death is terrible" (Mcmullin n.pag). Death was always frightening, but when the country gets sick, death becomes terrible fear and plague destroys 541 people and 542 people in the occurrence of plague.
The devastating plague occurred periodically between the middle of the 14th century and the 17th century. One of the occurrences is called Great Pest (1665 - 1666), with an estimated 75,000 to 100,000 lives in London, accounting for about a fifth of the city's population. Prior to the Industrial Revolution, the standard of living has hardly changed. If we set real UDP per capita GDP to 100 in 1566, it increased to 130 in 1806. This means that the annual growth rate of per capita income for 240 years is 0.11%. In other words, there is no major improvement in the quality of life for most people on average.
In the 14th century from China, the most serious plague has occurred so far. This occurrence was called black death. Infectious diseases from China spread to Europe through two pathways. Since China is a major trade center, plague spreads easily on board. In addition, after siege in Asia, monks brought plague to Europe and other trade ports. This occurred destroyed not only Asia and Europe but also Russia. Thanks to Black Death, more than one-third of Europe's population, or 25 million people, died. In Europe all stopped during the plague, but public health agencies were established to prevent the spread of plague.