Gce Model Questions Vol1 2019 Biology Question 26

Practice objective / multiple choice question 26 from the 2019 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2019 Biology Objective / Multiple Choice Hard Difficulty
Question 26 GCE_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • objective

A disease has a basic reproduction number \(R_{0}=3.5\). A vaccine is 80% effective (i.e., each vaccinated individual reduces susceptibility by 0.80). What minimum proportion of the total population must be vaccinated to achieve herd immunity? After calculating this threshold, state whether vaccinating 70% of the population would be sufficient.

Answer Options

A. Minimum proportion ≈ 0.750 (75.0%). Vaccinating 70% would be sufficient.
Correct Answer B. Minimum proportion ≈ 0.893 (89.3%). Vaccinating 70% is not sufficient.
C. Minimum proportion ≈ 0.950 (95.0%). Vaccinating 70% is not sufficient.
D. Minimum proportion ≈ 0.714 (71.4%). Vaccinating 70% is not sufficient.
Correct Answer
B
Correct Option:
Minimum proportion ≈ 0.893 (89.3%). Vaccinating 70% is not sufficient.

About This Question

This is Gce Model Questions Vol1 2019 Biology Question 26. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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