Gce Model Questions Vol1 2019 Agricultural Science Question 45

Practice objective / multiple choice question 45 from the 2019 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2019 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 45 GCE_MODEL_QUESTIONS_VOL1 • 2019 • AGRICULTURAL_SCIENCE • objective

In a herd of 120 cattle, bovine viral diarrhoea (BVD) has a basic reproduction number \(R_0 = 2.5\). A vaccine reduces susceptibility by 80 % and is 90 % effective (i.e., 90 % of vaccinated animals develop immunity). What is the minimum proportion of the herd that must be vaccinated to achieve herd immunity (effective reproduction number \(R_e < 1\))? Give your answer as a percentage (to one decimal place) and the corresponding number of cattle (rounded up to the nearest whole animal).

Answer Options

Correct Answer A. 83.4 % of the herd, i.e., at least 101 cattle
B. 85.0 % of the herd, i.e., at least 102 cattle
C. 75.0 % of the herd, i.e., at least 90 cattle
D. 80.0 % of the herd, i.e., at least 96 cattle
Correct Answer
A
Correct Option:
83.4 % of the herd, i.e., at least 101 cattle

About This Question

This is Gce Model Questions Vol1 2019 Agricultural Science Question 45. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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