Neco 2025 Agricultural Science Question 19
Practice objective / multiple choice question 19 from the 2025 Neco Agricultural Science examination.
In a poultry farm of 500 chickens, a viral disease has a basic reproduction number \(R_0 = 2.5\). A vaccine with 80% efficacy is available. If \(p\) is the proportion of the flock that is vaccinated, the effective reproduction number becomes \(R_e = R_0 \times (1 - \text{efficacy} \times p)\). The disease will die out if \(R_e < 1\). What is the minimum integer number of chickens that must be vaccinated to ensure the disease cannot spread? Provide the number of chickens.
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About This Question
This is Neco 2025 Agricultural Science Question 19. It is one of the objective questions from the 2025 Neco Agricultural Science examination.
Difficulty level: Medium .
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