Perspective | Booster shots wont stop the delta variant. Heres the math to prove it. – The Washington Post

The Re helps us approximate how much an illness might spread when a population has at least some resistance. Technically speaking, the Re measures how many new individuals a single individual contaminates, accounting for whatever precautions people are taking and overall immunity levels. Whether were talking about the Re or the R0, any value larger than 1 suggests difficulty, due to the fact that if each individual can infect more than one other individual, any disease break out will continue to spread out tremendously unless we take action.

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