Waec Model Questions Vol1 2022 Biology Question 10
Practice objective / multiple choice question 10 from the 2022 Waec Model Questions Vol1 Biology examination.
In a community of 10 000 people an infectious disease shows exponential growth, with the number of cases doubling every 5 days. The average infectious period is 7 days. Assuming a simple SIR model where the early‑growth rate $r$ satisfies $r = (R_0-1)/D$, estimate the basic reproduction number $R_0$ and the proportion of the population that must be immunised to achieve herd immunity (threshold = $1-1/R_0$). Express the herd‑immunity proportion as a percentage.
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This is Waec Model Questions Vol1 2022 Biology Question 10. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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