Neco Model Questions Vol1 2025 Agricultural Science Question 35
Practice objective / multiple choice question 35 from the 2025 Neco Model Questions Vol1 Agricultural Science examination.
A poultry farm has 800 chickens. A new strain of Newcastle disease has a basic reproduction number \(R_0 = 4.5\). The available vaccine reduces susceptibility by 80 % (i.e., a vaccinated bird is only 20 % as likely to become infected). To achieve herd immunity the proportion of the flock that must be effectively immune is \(p_c = 1 - \frac{1}{R_0}\). Determine the minimum number of chickens that must be vaccinated to obtain herd immunity, taking the vaccine effectiveness into account. Round up to the nearest whole chicken.
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About This Question
This is Neco Model Questions Vol1 2025 Agricultural Science Question 35. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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