In infectious disease epidemiology, what measure is a useful indicator of the severity of an outbreak, calculated as the number of cases out of the number of susceptible people?

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The attack rate is a measure used in epidemiology to describe the proportion of people who become ill in a population after exposure to an infectious agent, making it a useful indicator of the severity of an outbreak. It is calculated as the number of new cases divided by the number of susceptible individuals.

In Infectious Disease Epidemiology, What Measure Is a Useful Indicator