Since the reign of Emperor Justinian in 542 A.D., man has one unwelcome organism along for the ride, Yersinia pestis. This is the bacterium more commonly know as the Black Death, the plague. Plague is divided into three biotypes, each associated with one of three major pandemics occurring in history. Each of these biotypes are then divided into three distinct types, classified by method of infection. The most widely know is bubonic, an infection of …showed first 75 words of 579 total…

…showed last 75 words of 579 total…of care. Henry Knighton noted more than 5,000 dead sheep in one field alone. The death of a very large portion of the work force aided those that were still living. The sheer scarcity of workers enabled the remainder to make demands of higher wages and better conditions. Farms located on poor soil were abandoned because the demand for grain had decreased, enabling fewer farms, located on the better tracts of land to feed the population.