Gce Model Questions Vol1 2018 Biology Question 42
Practice objective / multiple choice question 42 from the 2018 Gce Model Questions Vol1 Biology examination.
A contagious disease has a basic reproduction number \(R_0 = 3.5\). A vaccine is \(85\%\) effective at preventing infection. In the community, \(10\%\) of individuals are already immune due to prior infection. What minimum proportion of the total population must be vaccinated to bring the effective reproduction number below 1 (i.e., achieve herd immunity)? Express your answer as a percentage to the nearest whole number.
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This is Gce Model Questions Vol1 2018 Biology Question 42. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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