Waec Model Questions Vol1 2021 Agricultural Science Question 18
Practice objective / multiple choice question 18 from the 2021 Waec Model Questions Vol1 Agricultural Science examination.
A contagious viral disease of cattle has a basic reproduction number (R₀) of 4. To achieve herd immunity the proportion p of the herd that must be immune satisfies p > 1 - 1/R₀. If a vaccine is 85 % effective, what is the minimum number of cattle that must be vaccinated in a herd of 200 to obtain herd immunity?
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About This Question
This is Waec Model Questions Vol1 2021 Agricultural Science Question 18. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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