Waec Model Questions Vol1 2018 Agricultural Science Question 40
Practice objective / multiple choice question 40 from the 2018 Waec Model Questions Vol1 Agricultural Science examination.
A herd of 200 cattle is at risk of foot‑and‑mouth disease (FMD). The basic reproduction number (R₀) for FMD in this herd is estimated at 2.5. To achieve herd immunity, the proportion p of immune animals must satisfy p > 1 - 1/R₀. The available vaccine is 80 % effective, meaning only 80 % of vaccinated animals become immune. What is the minimum number of cattle that must be vaccinated to obtain herd immunity?
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About This Question
This is Waec Model Questions Vol1 2018 Agricultural Science Question 40. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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