Igcse Model Questions Vol1 2020 Biology Question 13
Practice objective / multiple choice question 13 from the 2020 Igcse Model Questions Vol1 Biology examination.
A newly emerging infectious disease has a basic reproduction number \(R_0 = 3\). To achieve herd immunity, a proportion \(p\) of the population must be immune, where \(p = 1 - \frac{1}{R_0}\). A vaccine available for this disease is only \(80\%\) effective at preventing infection. What minimum proportion of the total population must be vaccinated to achieve herd immunity? Express your answer as a decimal rounded to two decimal places.
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This is Igcse Model Questions Vol1 2020 Biology Question 13. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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