Neco Model Questions Vol1 2023 Biology Question 15

Practice objective / multiple choice question 15 from the 2023 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 15 NECO_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

A newly emerging viral disease has a basic reproduction number \(R_{0}=2.5\). A vaccine available for the disease has an efficacy of \(85\%\). (a) Calculate the herd‑immunity threshold \(H\) (the proportion of the population that must be immune to stop transmission). (b) Determine the minimum vaccination coverage \(V_{\text{min}}\) required to achieve herd immunity, taking vaccine efficacy into account. (c) If the current vaccination coverage in the community is \(70\%\), assess whether herd immunity has been attained.

Answer Options

A. (a) 0.60; (b) 0.706 (≈70.6%); (c) Attained - herd immunity achieved
B. (a) 0.55; (b) 0.706 (≈70.6%); (c) Not attained - herd immunity not achieved
Correct Answer C. (a) 0.60; (b) 0.706 (≈70.6%); (c) Not attained - herd immunity not achieved
D. (a) 0.60; (b) 0.65 (≈65%); (c) Not attained - herd immunity not achieved
Correct Answer
C
Correct Option:
(a) 0.60; (b) 0.706 (≈70.6%); (c) Not attained - herd immunity not achieved

About This Question

This is Neco Model Questions Vol1 2023 Biology Question 15. It is one of the objective questions from the 2023 Neco Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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