Neco Model Questions Vol1 2024 Biology Question 40

Practice objective / multiple choice question 40 from the 2024 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2024 Biology Objective / Multiple Choice Hard Difficulty
Question 40 NECO_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • objective

In a community of 10,000 people an outbreak of disease X occurs. Each infected person makes sufficient contact for transmission with 0.6 susceptible persons per day and remains infectious for 4 days.\ (a) Calculate the basic reproduction number \(R_{0}\).\ (b) What proportion of the population must be immunised (perfect vaccine) to achieve herd immunity?\ (c) A vaccination programme reaches 70 % of the population with a vaccine that is 85 % effective. Determine the effective reproduction number \(R_{e}\).\ (d) Based on \(R_{e}\), will the disease continue to spread? Justify.

Answer Options

Correct Answer A. R0 = 2.4; herd immunity needed ≈ 58.3 %; Re ≈ 0.97; disease will not continue to spread
B. R0 = 2.0; herd immunity needed ≈ 50.0 %; Re ≈ 1.20; disease will continue to spread
C. R0 = 3.2; herd immunity needed ≈ 68.8 %; Re ≈ 0.55; disease will not continue to spread
D. R0 = 1.8; herd immunity needed ≈ 44.4 %; Re ≈ 1.05; disease will continue to spread
Correct Answer
A
Correct Option:
R0 = 2.4; herd immunity needed ≈ 58.3 %; Re ≈ 0.97; disease will not continue to spread

About This Question

This is Neco Model Questions Vol1 2024 Biology Question 40. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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