Neco Model Questions Vol1 2019 Biology Question 11
Practice objective / multiple choice question 11 from the 2019 Neco Model Questions Vol1 Biology examination.
A newly emerging viral disease has a basic reproduction number \(R_0 = 3.5\). A vaccine available for this disease is 80 % effective in preventing infection. (a) What is the minimum proportion of the total population that must be immunised with this vaccine to achieve herd immunity? Express your answer as a percentage to one decimal place. (b) If only 60 % of the population can be reached by the vaccination programme, what is the effective reproduction number \(R_{\text{eff}}\) that would result?
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This is Neco Model Questions Vol1 2019 Biology Question 11. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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