Contagion rates: How they are affected by knowledge and behavior

“How contagious is the disease?” is an important question. 

The rate of contagion is the expected number of new cases of a disease that is likely to be caused by one case in a population where all persons in the population are susceptible. This is not necessarily how dangerous a disease is: one disease may be 100 percent fatal, but not contagious, another may spread like wildfire, but with little to no symptoms.

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