Neco 2018 Biology Question 16

Practice objective / multiple choice question 16 from the 2018 Neco Biology examination.

Neco 2018 Biology Objective / Multiple Choice Hard Difficulty
Question 16 NECO • 2018 • BIOLOGY • objective

A newly emerging infectious disease has a basic reproduction number \(R_{0}=2.5\). A vaccine available for the disease is 80% effective.\n\n(a) Calculate the minimum proportion of the total population that must be immunised (by vaccination) to achieve herd immunity.\n\n(b) In a community of 12,000 people, 10% are already immune because they recovered from a previous infection. How many additional individuals must be vaccinated to reach the herd‑immunity level calculated in part (a)?\n\n(c) If the same vaccine's effectiveness drops to 60%, what proportion of the whole population would now need to be vaccinated to obtain herd immunity?

Answer Options

Correct Answer A. (a) 75 % of the population must be vaccinated. (b) 9,750 additional people need to be vaccinated. (c) With 60 % efficacy, 100 % of the population would have to be vaccinated.
B. (a) 70 % of the population must be vaccinated. (b) 9,000 additional people need to be vaccinated. (c) With 60 % efficacy, 95 % of the population would have to be vaccinated.
C. (a) 65 % of the population must be vaccinated. (b) 8,500 additional people need to be vaccinated. (c) With 60 % efficacy, 85 % of the population would have to be vaccinated.
D. (a) 80 % of the population must be vaccinated. (b) 10,200 additional people need to be vaccinated. (c) With 60 % efficacy, 110 % of the population would have to be vaccinated.
Correct Answer
A
Correct Option:
(a) 75 % of the population must be vaccinated. (b) 9,750 additional people need to be vaccinated. (c) With 60 % efficacy, 100 % of the population would have to be vaccinated.

About This Question

This is Neco 2018 Biology Question 16. It is one of the objective questions from the 2018 Neco Biology examination.

Difficulty level: Hard .

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