Neco Model Questions Vol1 2018 Biology Question 7

Practice objective / multiple choice question 7 from the 2018 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2018 Biology Objective / Multiple Choice Hard Difficulty
Question 7 NECO_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective

A new viral disease has a basic reproduction number \(R_0 = 3.5\). The available vaccine is \(80\%\) effective. (i) What is the minimum proportion of the total population that must be vaccinated to achieve herd immunity? (ii) If the disease incubation period is \(5\) days and an infected individual becomes infectious \(2\) days after infection, how many days after the onset of symptoms will the individual have been infectious?

Answer Options

A. Approximately 85% (about 0.85) of the population must be vaccinated; the individual has been infectious for 5 days by the time symptoms appear.
B. Approximately 92% (about 0.92) of the population must be vaccinated; the individual has been infectious for 4 days by the time symptoms appear.
C. Approximately 78% (about 0.78) of the population must be vaccinated; the individual has been infectious for 2 days by the time symptoms appear.
Correct Answer D. Approximately 89% (about 0.89) of the population must be vaccinated; the individual has been infectious for 3 days by the time symptoms appear.
Correct Answer
D
Correct Option:
Approximately 89% (about 0.89) of the population must be vaccinated; the individual has been infectious for 3 days by the time symptoms appear.

About This Question

This is Neco Model Questions Vol1 2018 Biology Question 7. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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