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R0 (pronounced “R naught”), or reproduction rate, shows the average number of people who will contract a contagious disease from one person with that disease. The Effective R0 shows the reproduction rate of the disease when a portion of the population has already been immunized through previous infection or vaccination. As the R0 increases, total infections grow exponentially, meaning that even fractional changes in the R0 value can have a significant impact.

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