Waec Model Questions Vol1 2021 Biology Question 21
Practice objective / multiple choice question 21 from the 2021 Waec Model Questions Vol1 Biology examination.
A contagious disease has a basic reproduction number (R0) of 4.5. A vaccine available for this disease is 80% effective in preventing infection. What minimum proportion of the total population must be vaccinated (expressed as a percentage) to achieve herd immunity?
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This is Waec Model Questions Vol1 2021 Biology Question 21. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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