Neco Model Questions Vol1 2023 Agricultural Science Question 27
Practice objective / multiple choice question 27 from the 2023 Neco Model Questions Vol1 Agricultural Science examination.
A poultry farm holds 800 chickens. The disease affecting the flock has a basic reproduction number \(R_0 = 3.5\). A vaccine reduces susceptibility by 80 % (efficacy \(E = 0.80\)). To achieve herd immunity, the proportion that must be effectively immune is \(1 - 1/R_0\). Five percent of the chickens are already immune due to prior exposure. How many additional chickens must be vaccinated to reach the herd‑immunity target?
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This is Neco Model Questions Vol1 2023 Agricultural Science Question 27. It is one of the objective questions from the 2023 Neco Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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