Waec Model Questions Vol1 2019 Biology Question 3
Practice objective / multiple choice question 3 from the 2019 Waec Model Questions Vol1 Biology examination.
In a community of 2,000 individuals, 800 received vaccine X and 1,200 did not. Among the vaccinated, 20 developed disease Y, while among the unvaccinated, 180 developed the disease. (a) Determine the incidence of disease Y in each group. (b) Compute the relative risk (RR) and the vaccine efficacy expressed as a percentage. (c) If a new strain reduces the vaccine's efficacy by 30% relative to the original efficacy, how many cases of disease Y would be expected among the vaccinated group under the same exposure conditions?
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About This Question
This is Waec Model Questions Vol1 2019 Biology Question 3. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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