Neco 2022 Agricultural Science Question 29

Practice objective / multiple choice question 29 from the 2022 Neco Agricultural Science examination.

Neco 2022 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 29 NECO • 2022 • AGRICULTURAL_SCIENCE • objective

A cattle herd contains 120 animals. The disease affecting the herd has a basic reproduction number \(R_{0}=2.5\). A vaccine is 80 % effective at preventing infection. (i) What is the minimum number of cattle that must be vaccinated to achieve herd immunity (i.e., bring the effective reproduction number below 1)? (ii) If only 60 cattle are vaccinated, what is the resulting effective reproduction number?

Answer Options

A. At least 60 cattle must be vaccinated; with only 60 vaccinated the effective reproduction number is \\(2.0\\)
B. At least 80 cattle must be vaccinated; with only 60 vaccinated the effective reproduction number is \\(1.8\\)
C. At least 100 cattle must be vaccinated; with only 60 vaccinated the effective reproduction number is \\(1.2\\)
Correct Answer D. At least 90 cattle must be vaccinated; with only 60 vaccinated the effective reproduction number is \(1.5\)
Correct Answer
D
Correct Option:
At least 90 cattle must be vaccinated; with only 60 vaccinated the effective reproduction number is \(1.5\)

About This Question

This is Neco 2022 Agricultural Science Question 29. It is one of the objective questions from the 2022 Neco Agricultural Science examination.

Difficulty level: Medium .

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