Igcse Model Questions Vol1 2017 Biology Question 14
Practice objective / multiple choice question 14 from the 2017 Igcse Model Questions Vol1 Biology examination.
In a community 2000 people are vaccinated against disease X and 2000 are not. During one year 30 vaccinated individuals and 120 unvaccinated individuals develop the disease. (a) Calculate the relative risk (RR) of disease for the vaccinated group. (b) Using VE = (1 - RR) × 100 %, determine the vaccine efficacy. (c) If a new strain reduces the vaccine's efficacy by 25 % of the original efficacy, how many cases would be expected among 2000 vaccinated people, assuming the same exposure risk as before? Give the answer rounded to the nearest whole number.
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About This Question
This is Igcse Model Questions Vol1 2017 Biology Question 14. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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