Igcse Model Questions Vol1 2018 Biology Question 39

Practice objective / multiple choice question 39 from the 2018 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2018 Biology Objective / Multiple Choice Hard Difficulty
Question 39 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective

In a community a contagious disease has an average infectious period of 4 days. Each infected person contacts 6 people per day, and the probability of transmission per contact is \(p\). Observations show that each case generates on average 2.4 new cases over the infectious period. (a) Determine the value of \(p\). (b) What minimum proportion of contacts must be prevented (e.g., by vaccination or isolation) to reduce the basic reproduction number \(R_0\) to below 1?

Answer Options

A. p = 0.10 (10%); at least 45 % of contacts must be prevented
B. p = 0.08 (8%); at least 66.7 % of contacts must be prevented
Correct Answer C. p = 0.10 (10%); at least 58.3 % of contacts must be prevented
D. p = 0.12 (12%); at least 50 % of contacts must be prevented
Correct Answer
C
Correct Option:
p = 0.10 (10%); at least 58.3 % of contacts must be prevented

About This Question

This is Igcse Model Questions Vol1 2018 Biology Question 39. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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