Waec Model Questions Vol1 2023 Biology Question 34
Practice objective / multiple choice question 34 from the 2023 Waec Model Questions Vol1 Biology examination.
A contagious disease spreads with a transmission probability per contact of 0.04. An infected individual makes on average 15 contacts per day and remains infectious for 5 days.\n(a) Calculate the basic reproduction number R₀.\n(b) Determine the herd‑immunity threshold (as a percentage).\n(c) If a vaccine is 90 % effective, what minimum proportion of the population must be vaccinated to achieve herd immunity? Give your answer as a percentage rounded to the nearest whole number.
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This is Waec Model Questions Vol1 2023 Biology Question 34. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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