A bacterium that causes a common disease in a population that has been previously exposed to it is called _____.

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A bacterium that causes a common disease in a population that has been previously exposed to it is called endemic. Endemic diseases are those that are regularly found in a particular geographic region or population. They can be caused by a variety of factors, including environmental conditions, genetic predisposition, and exposure to infectious agents. However, because the population has been previously exposed, it may have developed some level of immunity or resistance to the disease.

A Bacterium That Causes a Common Disease in a Population