Neco Model Questions Vol1 2017 Agricultural Science Question 40

Practice objective / multiple choice question 40 from the 2017 Neco Model Questions Vol1 Agricultural Science examination.

Neco Model Questions Vol1 2017 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 40 NECO_MODEL_QUESTIONS_VOL1 • 2017 • AGRICULTURAL_SCIENCE • objective

In a cattle herd a contagious disease has a transmission coefficient \(\beta = 0.4\) per contact per day and a recovery rate \(\gamma = 0.1\) per day. Assuming homogeneous mixing, (a) calculate the basic reproduction number \(R_{0}\); (b) determine the herd‑immunity threshold (the minimum proportion of animals that must be immune to prevent an outbreak); and (c) for a herd of 200 cattle, compute the minimum number of animals that need to be vaccinated.

Answer Options

Correct Answer A. R₀ = 4; herd‑immunity threshold = 75 %; vaccinate at least 150 cattle
B. R₀ = 3; herd‑immunity threshold = 66 %; vaccinate at least 132 cattle
C. R₀ = 2; herd‑immunity threshold = 50 %; vaccinate at least 100 cattle
D. R₀ = 5; herd‑immunity threshold = 80 %; vaccinate at least 160 cattle
Correct Answer
A
Correct Option:
R₀ = 4; herd‑immunity threshold = 75 %; vaccinate at least 150 cattle

About This Question

This is Neco Model Questions Vol1 2017 Agricultural Science Question 40. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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