If R is 1.5 for example, and you start with 100 people with the virus, after 5 rounds you'd have 10*(1.5^5) = 75.9 infections.
100*(1.5^5) = 759 active infections
Hah, I wrote that first then double checked it and misread my own starting number as 10 so moved the decimal.
@duncs started
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100*(1.5^5) = 759 active infections