Waec Model Questions Vol1 2025 Agricultural Science Question 26
Practice objective / multiple choice question 26 from the 2025 Waec Model Questions Vol1 Agricultural Science examination.
In a herd of 200 cattle an outbreak of foot‑and‑mouth disease is recorded. After two weeks, 12 cattle have died, 28 have recovered and a total of 60 cattle were observed to be infected (including the dead and recovered). The basic reproduction number (R₀) for this disease in cattle is estimated at 3. A vaccine reduces susceptibility by 80 % (i.e. vaccinated animals have only 20 % of the chance of becoming infected). What minimum proportion of the whole herd must be vaccinated before the outbreak to ensure the effective reproduction number (Rₑ) falls below 1, thereby preventing sustained transmission? Express your answer as a percentage rounded to the nearest whole number.
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About This Question
This is Waec Model Questions Vol1 2025 Agricultural Science Question 26. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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