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1. An epidemic occurs when an infection affects a large number of people within a population, such as a city. A pandemic affects an even greater number of people across a wider area. 2. The Black Death pandemic in the 1300s was caused by the Yersinia pestis bacteria and had symptoms of chills, fever, vomiting, and black boils oozing pus and blood. It killed over 20 million people in Europe. 3. Now we have improved medical knowledge of how diseases spread, effective antibiotics and vaccines to prevent pan

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api-264004571

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EN