Waec Model Questions Vol1 2025 Biology Question 32
Practice objective / multiple choice question 32 from the 2025 Waec Model Questions Vol1 Biology examination.
A newly emerging viral disease has a basic reproduction number (R₀) of 4.5. A vaccine is 80 % effective at preventing infection. In the community, 10 % of the population is already immune because of prior infection. What minimum proportion of the total population must be vaccinated to achieve herd immunity?
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This is Waec Model Questions Vol1 2025 Biology Question 32. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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