Waec Model Questions Vol1 2018 Biology Question 44
Practice objective / multiple choice question 44 from the 2018 Waec Model Questions Vol1 Biology examination.
In a closed community of 10,000 people an infectious disease spreads. The average infectious period is 4 days. During the early exponential phase the number of cases rose from 50 to 200 in 6 days. Assuming exponential growth, estimate the transmission rate β (per day) and compute the basic reproduction number R₀ = β × infectious period. Then determine the minimum proportion of the population that must be immunised to achieve herd immunity (threshold = 1 - 1/R₀). Give the herd‑immunity threshold as a percentage rounded to the nearest whole number.
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About This Question
This is Waec Model Questions Vol1 2018 Biology Question 44. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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