Gce Model Questions Vol1 2017 Agricultural Science Question 24

Practice objective / multiple choice question 24 from the 2017 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2017 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 24 GCE_MODEL_QUESTIONS_VOL1 • 2017 • AGRICULTURAL_SCIENCE • objective

A flock of 200 unvaccinated sheep experiences 30 cases of pneumonia in a year. In a separate group of 150 sheep that were vaccinated against the disease, 9 cases occurred in the same period.\n\n(a) Calculate the incidence of pneumonia in each group.\n(b) Determine the relative risk (RR) of disease in unvaccinated versus vaccinated sheep.\n(c) Using the formula \( \text{Vaccine efficacy} = \bigl(1 - \frac{I_v}{I_u}\bigr)\times 100\% \), where \(I_v\) and \(I_u\) are the incidences in the vaccinated and unvaccinated groups respectively, calculate the vaccine efficacy.

Answer Options

A. Incidence unvaccinated 0.15, vaccinated 0.06; RR = 0.4; Vaccine efficacy = 40 %
B. Incidence unvaccinated 0.12, vaccinated 0.06; RR = 2.0; Vaccine efficacy = 50 %
Correct Answer C. Incidence unvaccinated 0.15, vaccinated 0.06; RR = 2.5; Vaccine efficacy = 60 %
D. Incidence unvaccinated 0.15, vaccinated 0.045; RR = 3.33; Vaccine efficacy = 70 %
Correct Answer
C
Correct Option:
Incidence unvaccinated 0.15, vaccinated 0.06; RR = 2.5; Vaccine efficacy = 60 %

About This Question

This is Gce Model Questions Vol1 2017 Agricultural Science Question 24. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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