Neco Model Questions Vol1 2020 Biology Question 17
Practice objective / multiple choice question 17 from the 2020 Neco Model Questions Vol1 Biology examination.
In a community, an infectious disease shows case numbers doubling every 5 days. The average infectious period is 7 days. Assuming a simple SIR model, estimate the basic reproduction number \(R_0\) using the approximation \(R_0 = 1 + \frac{D\ln 2}{T_d}\), where \(D\) is the infectious period and \(T_d\) the doubling time. Then determine the herd‑immunity threshold \(H = 1 - \frac{1}{R_0}\). If a vaccine has an efficacy of 85\%, what proportion of the total population must be vaccinated to achieve herd immunity?
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This is Neco Model Questions Vol1 2020 Biology Question 17. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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