Neco Model Questions Vol1 2019 Biology Question 40
Practice objective / multiple choice question 40 from the 2019 Neco Model Questions Vol1 Biology examination.
A contagious disease has a basic reproduction number \( R_0 = 3.5 \) in a community. A vaccine available for the disease is 85 % effective at preventing infection. Using the herd‑immunity formula \( p_c = \dfrac{1 - 1/R_0}{\text{efficacy}} \), calculate the minimum proportion of the total population that must be vaccinated to achieve herd immunity. Express your answer as a percentage rounded to the nearest whole number.
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This is Neco Model Questions Vol1 2019 Biology Question 40. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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