Neco Model Questions Vol1 2017 Biology Question 45

Practice objective / multiple choice question 45 from the 2017 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2017 Biology Objective / Multiple Choice Hard Difficulty
Question 45 NECO_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • objective

In a community of 10 000 people, an outbreak of disease X occurs. The disease has a generation time of 4 days. Starting from a single index case, the total number of cases after three generations is 125. (a) Determine the basic reproduction number \(R_0\). (b) A vaccine with 85 % efficacy is introduced. What minimum proportion of the population must be vaccinated to achieve herd immunity (i.e., to reduce the effective reproduction number below 1)?

Answer Options

Correct Answer A. R₀ = 5; at least 94.1 % of the population must be vaccinated
B. R₀ = 6; at least 85 % of the population must be vaccinated
C. R₀ = 4; at least 88 % of the population must be vaccinated
D. R₀ = 5; at least 70 % of the population must be vaccinated
Correct Answer
A
Correct Option:
R₀ = 5; at least 94.1 % of the population must be vaccinated

About This Question

This is Neco Model Questions Vol1 2017 Biology Question 45. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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