Waec Model Questions Vol1 2018 Agricultural Science Question 18
Practice objective / multiple choice question 18 from the 2018 Waec Model Questions Vol1 Agricultural Science examination.
A herd of 200 goats is at risk of Peste des petits ruminants (PPR). The basic reproduction number (R₀) for PPR in goats is estimated at 3.5, and the vaccine used has an efficacy of 85 %. Using the herd‑immunity threshold formula H = (1 - 1/R₀) ÷ E, where E is vaccine efficacy expressed as a decimal, determine the minimum number of goats that must be vaccinated to achieve herd immunity. Round up to the nearest whole goat.
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About This Question
This is Waec Model Questions Vol1 2018 Agricultural Science Question 18. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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