Neco Model Questions Vol1 2021 Biology Question 21
Practice objective / multiple choice question 21 from the 2021 Neco Model Questions Vol1 Biology examination.
A newly emerging infectious disease has a basic reproduction number \(R_0 = 3.5\). A vaccine available for this disease is 80 % effective in preventing infection, and 10 % of the population is already immune due to prior exposure. What is the minimum proportion of the total population that must be vaccinated to achieve herd immunity (i.e., to make the effective reproduction number less than 1)? Express your answer as a percentage rounded to the nearest whole number.
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This is Neco Model Questions Vol1 2021 Biology Question 21. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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