Gce Model Questions Vol1 2022 Biology Question 6

Practice objective / multiple choice question 6 from the 2022 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2022 Biology Objective / Multiple Choice Hard Difficulty
Question 6 GCE_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

A new vaccine for a contagious disease has an efficacy of 85 %. The basic reproduction number (R₀) of the pathogen in a completely susceptible population is 3.2. Using the herd‑immunity formula \(V_c = \frac{1-1/R_0}{\text{efficacy}}\), calculate the minimum proportion of the total population that must be vaccinated to prevent an outbreak. If only 60 % of the population can be vaccinated, will the outbreak be prevented?

Answer Options

Correct Answer A. No - at least about 81 % must be vaccinated, which exceeds the available 60 %.
B. No - at least about 71 % must be vaccinated, which exceeds the available 60 %.
C. No - at least about 90 % must be vaccinated, which exceeds the available 60 %.
D. No - at least about 65 % must be vaccinated, which exceeds the available 60 %.
Correct Answer
A
Correct Option:
No - at least about 81 % must be vaccinated, which exceeds the available 60 %.

About This Question

This is Gce Model Questions Vol1 2022 Biology Question 6. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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