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 a objective / multiple choice question from the 2019 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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