Since the reign of Emperor Justinian in 542 A.D., man has one uninvited organism along for the ride, Yersinia pestis. This is the bacterium more commonly whop as the Black Death, the afflict. Plague is divided into three biotypes, severally associated with one of three major pandemics occurring in history. Each of these biotypes atomic number 18 then divided into three distinct types, classified by method of infection.
The or so widely know is bubonic, an infection of fire that resides in the lymph nodes, causing them to swell. The Black Death of the fourteenth coke was mainly of this type. Bubonic plague is commonly spread finished fleas that have made a meal from an infected genus Rattus rattus.
The most dangerous type of plague is pneumonic. It can be spread done aerosol droplets released through coughs, sneezes, or through fluid contact. It may also become a unoriginal result of a case of untreated bubonic or septicemic plague. Although not as common as the bubonic strain, it is more deadly. It has an untreated mortality rate on just about 100%, as compared to 50% untreated mortality for bubonic plague. It attacks the respiratory track, furthering the cycle.
The third type of plague is septemic. It is spread by direct bodily fluid contact. It may also initiate as a secondary result of untreated bubonic or pneumonic plague.
A LITTLE HISTORY As mentioned before, the most known incidence of bubonic plague was in 14th century Europe. In 1346 reports of a terrible pestilence in China, spreading through Mesopotamia and Asia Minor had reached Europe, but caused no foreboding until two years later. In January of 1348 the plague had reached Marseille in France and capital of Tunisia in Africa. By the end of the next year the plague had reached as far as Norway, Scotland, Prussia, Iceland, and Italy.
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