Gce Model Questions Vol1 2023 Agricultural Science Question 8

Practice objective / multiple choice question 8 from the 2023 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2023 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 8 GCE_MODEL_QUESTIONS_VOL1 • 2023 • AGRICULTURAL_SCIENCE • objective

In a poultry flock a contagious disease has a transmission coefficient \(\beta = 0.8\) per day and an average infectious period of \(5\) days. The disease‑induced mortality proportion is \(0.2\) (mortality does not affect transmission).\n(a) Calculate the basic reproduction number \(R_{0}\).\n(b) Determine the minimum proportion of the flock that must be immunised with a perfect vaccine to reduce the effective reproduction number below 1.\n(c) If only 60 % of the birds can be vaccinated, will an outbreak be prevented?

Answer Options

A. R₀ = 3; at least 75 % must be vaccinated; 60 % vaccination is insufficient - outbreak not prevented
B. R₀ = 4; at least 70 % must be vaccinated; 60 % vaccination is sufficient - outbreak prevented
Correct Answer C. R₀ = 4; at least 75 % must be vaccinated; 60 % vaccination is insufficient - outbreak not prevented
D. R₀ = 5; at least 80 % must be vaccinated; 60 % vaccination is insufficient - outbreak not prevented
Correct Answer
C
Correct Option:
R₀ = 4; at least 75 % must be vaccinated; 60 % vaccination is insufficient - outbreak not prevented

About This Question

This is Gce Model Questions Vol1 2023 Agricultural Science Question 8. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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