Waec Model Questions Vol1 2025 Biology Question 3
Practice objective / multiple choice question 3 from the 2025 Waec Model Questions Vol1 Biology examination.
During the first four weeks of an outbreak of disease X in a community of 10 000 people, the number of new cases each week was 80, 120, 180 and 270 respectively. Assuming the epidemic grows exponentially with a generation time of 7 days, (a) estimate the basic reproduction number R₀, and (b) if a vaccine with 80 % efficacy is introduced, what minimum proportion of the population must be vaccinated to achieve herd immunity? Express your answer as a percentage.
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This is Waec Model Questions Vol1 2025 Biology Question 3. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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