Pandemics, once triggered, are expected to spread throughout the world. We cannot prevent their spread; once they erupt, they continually spread. The Black Death was a disease that spread throughout the Mediterranean and Europe. There have been around 25 million deaths in Europe alone. The Black Death was caused by the bacteria called Yersinia Pestis in the 13th century. The Black Death, also known as the Bubonic Plague, was caused by the contamination of a single person. The Black Death was caused by a single bacteria, found in places like Europe, which affected a large portion of the population by simply killing them. The Black Death began with a bacteria called Yersinia Pestis. “Yersinia Pestis, or known as pasteurella pestis, causes serious illness, but most often death from infection, unless implanted with antibiotics” (Sutyak). This bacteria spreads quickly. “On average, bacteria can double every 4 to 20 minutes” (Pacific Northwest National Laboratory). This means that when one person was infected, 72 other people could become infected over the course of the day if the rate was one person every 20 minutes. If the rate was one person every 4 minutes, there could be 360 ​​people infected in a day. This infection rate is extremely appalling. Imagine if someone in your town contracted a terrible disease. Then the disease spread within a day. Three hundred and sixty people infected in one day. This is extremely disgusting from my point of view. Now let's go further. “Pandemics can affect 20 to 40 percent of the entire world population” (US Department of Health and Human Services). The Black Death caused the deaths of 75 to 200 million people. This represented a large part of the population at the time. When everyone died, many places had little paper left......and web. March 25, 2014. “Remedies for the Black Death.” Remedies for the Black Death. Np, and Web. March 23, 2014."History of pandemic influenza." Home. US Department of Health and Human Services, nd Web. March 23, 2014. “The Middle Ages.” Onondaga Central School District. Np, and Web. March 25, 2014..Sutyak, Katia. “Yersinia Pestis.” Web.uconn.edu/. Np, and Web. March 23, 2014.FY.%2520pestis%2FYersinia%2520pestis.html>.Wheeler, Dr. “Black Death: The Least You Need to Know.” Black Death: The Least You Need to Know. Carson-Newman University, nd Web. March 23. 2014..