Gce Model Questions Vol1 2021 Biology Question 11

Practice objective / multiple choice question 11 from the 2021 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2021 Biology Objective / Multiple Choice Hard Difficulty
Question 11 GCE_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • objective

A disease has a basic reproduction number \(R_0 = 3.5\). A vaccine is \(80\%\) effective at preventing infection. (a) What proportion of the total population must be vaccinated to achieve herd immunity? (b) If only \(60\%\) of the population can be vaccinated, what is the effective reproduction number after vaccination? Give your answers as decimals rounded to two significant figures.

Answer Options

A. Vaccination coverage ≈ 0.89; effective \(R \approx 2.1\)
B. Vaccination coverage ≈ 0.95; effective \(R \approx 1.5\)
C. Vaccination coverage ≈ 0.71; effective \(R \approx 1.8\)
Correct Answer D. Vaccination coverage ≈ 0.89; effective \(R \approx 1.8\)
Correct Answer
D
Correct Option:
Vaccination coverage ≈ 0.89; effective \(R \approx 1.8\)

About This Question

This is Gce Model Questions Vol1 2021 Biology Question 11. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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