Waec Model Questions Vol1 2022 Biology Question 47
Practice objective / multiple choice question 47 from the 2022 Waec Model Questions Vol1 Biology examination.
In a town of 10,000 people, 10 % are already immune to a contagious disease because they recovered from a previous outbreak. The disease has a basic reproduction number R₀ = 2.5. A vaccine available is 80 % effective in preventing infection. What is the minimum number of additional people that must be vaccinated to achieve herd immunity and stop further transmission?
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About This Question
This is Waec Model Questions Vol1 2022 Biology Question 47. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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