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How many people do we need to vaccinate?

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Suppose R 0 = 10 How many new infections result from each infected person on average? 10 So how many people do we need to vaccinate to reduce R 0 to 1 or less? 9 What proportion of the population do we need to vaccinate therefore? 90%

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Suppose R 0 = 20 How many new infections result from each infected person on average? 20 So how many people do we need to vaccinate to reduce R 0 to 1 or less? 19 What proportion of the population do we need to vaccinate therefore? 95%

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Suppose R 0 = 5 How many new infections result from each infected person on average? 5 So how many people do we need to vaccinate to reduce R 0 to 1 or less? 4 What proportion of the population do we need to vaccinate therefore? 80%

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Suppose R 0 = r How many new infections result from each infected person on average? r So how many people do we need to vaccinate to reduce R 0 to 1 or less? r - 1 What proportion of the population do we need to vaccinate therefore?

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