# Simple Dynamics of Epidemics, the Reproduction Number

Simple Dynamics of Epidemics, the Reproduction Number

In epidemiology, the basic reproduction number is the expected number of new infections from a single infection in a population where all subjects are susceptible [1]. This metric is useful because it helps determine whether or not an infectious disease can spread through a population. When <1, the infection will die in the long run. But if >1, the infection will spread in the population. Generally, the greater the value of , the harder it is to control the epidemic. This Demonstration solves a simple epidemic model and shows the conditions necessary for the outbreak of an infection to result in an epidemic.

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