Waec Model Questions Vol1 2018 Agricultural Science Question 45
Practice objective / multiple choice question 45 from the 2018 Waec Model Questions Vol1 Agricultural Science examination.
A herd of 200 cattle is at risk of a contagious disease whose basic reproduction number (R₀) is 2.5. A vaccine available for the disease is 80 % effective. What is the minimum number of cattle that must be vaccinated to achieve herd immunity (i.e., to reduce the effective reproduction number below 1)?
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About This Question
This is Waec Model Questions Vol1 2018 Agricultural Science Question 45. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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