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Answer:
1. Emerging infectious diseases are those whose incidence in humans has increased in the past 2 decades or threaten to increase in the near future. These diseases, which respect no national boundaries, can challenge efforts to protect workers as prevention and control recommendations may not be immediately available.
2. AN EPIDEMIC is a disease that affects a large number of people within a community, population, or region.
3. A PANDEMIC is an epidemic that's spread over multiple countries or continents.