Igcse Model Questions Vol1 2019 Biology Question 33
Practice objective / multiple choice question 33 from the 2019 Igcse Model Questions Vol1 Biology examination.
A contagious disease has a basic reproduction number \(R_0 = 3.5\). A vaccine available for the disease is \(85\%\) effective at preventing infection. Using the herd‑immunity principle, what minimum proportion of the total population must be vaccinated to stop the spread of the disease? Express your answer as a percentage rounded to the nearest whole number.
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About This Question
This is Igcse Model Questions Vol1 2019 Biology Question 33. It is one of the objective questions from the 2019 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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