Gce Model Questions Vol1 2019 Biology Question 3

Practice objective / multiple choice question 3 from the 2019 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2019 Biology Objective / Multiple Choice Hard Difficulty
Question 3 GCE_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • objective

A contagious disease has a basic reproduction number \(R_{0}=3.5\). A vaccine available for the disease is \(85\%\) effective at preventing infection.\n(a) What minimum proportion of the total population must be vaccinated to achieve herd immunity?\n(b) If only \(60\%\) of the population is willing to be vaccinated, calculate the effective reproduction number \(R_{e}\) after vaccination.

Answer Options

Correct Answer A. 84% of the population must be vaccinated; with 60% coverage, Re ≈ 1.72
B. 78% of the population must be vaccinated; with 60% coverage, Re ≈ 2.10
C. 80% of the population must be vaccinated; with 60% coverage, Re ≈ 1.85
D. 90% of the population must be vaccinated; with 60% coverage, Re ≈ 1.55
Correct Answer
A
Correct Option:
84% of the population must be vaccinated; with 60% coverage, Re ≈ 1.72

About This Question

This is Gce Model Questions Vol1 2019 Biology Question 3. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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