Waec Model Questions Vol1 2023 Agricultural Science Question 44
Practice objective / multiple choice question 44 from the 2023 Waec Model Questions Vol1 Agricultural Science examination.
In a herd of 200 goats, an outbreak of peste des petits ruminants (PPR) occurs. Clinical signs are observed in 120 goats, of which 30 die. Laboratory testing confirms that 90 % of the clinically sick goats are truly infected. (Assume no asymptomatic infections.) Calculate (a) the number of goats that are actually infected, (b) the case‑fatality rate among the infected goats (as a percentage), and (c) the proportion of the whole herd that must be vaccinated to achieve herd immunity if the basic reproduction number R₀ = 5 and the vaccine efficacy is 90 %.
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About This Question
This is Waec Model Questions Vol1 2023 Agricultural Science Question 44. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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