Gce Model Questions Vol1 2020 Biology Question 36
Practice objective / multiple choice question 36 from the 2020 Gce Model Questions Vol1 Biology examination.
In a closed community of 2000 people, an outbreak of disease X shows that the number of cases doubles every 3 days during the initial exponential phase. The average infectious period of the disease is 7 days. (a) Estimate the basic reproduction number \(R_{0}\) using the relation \(R_{0}=1+D\,r\), where \(D\) is the infectious period and \(r\) is the exponential growth rate per day. (b) Calculate the herd‑immunity threshold \(H=1-\frac{1}{R_{0}}\). (c) A vaccination programme can achieve 55 % coverage with a vaccine that is 90 % effective. Will herd immunity be attained? Justify your answer with calculations.
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This is Gce Model Questions Vol1 2020 Biology Question 36. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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