Description: Epidemics and pandemics are among the biggest threats facing the world today, killing millions of people. Epidemics are outbreaks of a disease within a particular area. Pandemics such as COVID-19 occur on a larger scale when an epidemic spreads from one region to a wider area. Discover more in Epidemics and Pandemics, a title in the Growth, Development, and Reproduction of the Human Body series.