The following is an Assertion/Reason question. These questions consist of two statements, each printed as Assertion and Reason. Read both statements carefully and then select the correct answer from the options below [table]
Assertion | | Reason Herd immunity is a form of indirect protection against an infectious disease | Because | herd immunity occurs when a sufficiently large proportion of the population is immune to the disease via vaccination or prior natural exposure
[/table]

Question

The following is an Assertion/Reason question. These questions consist of two statements, each printed as Assertion and Reason. Read both statements carefully and then select the correct answer from the options below [table]
Assertion |  | Reason Herd immunity is a form of indirect protection against an infectious disease | Because | herd immunity occurs when a sufficiently large proportion of the population is immune to the disease via vaccination or prior natural exposure
[/table]

BlackTom AI · Accepted Answer

To approach this Assertion/Reason question, I will evaluate each statement carefully before identifying the correct option.
Option a: The Assertion says herd immunity is a form of indirect protection against an infectious disease. This is true because when a large portion of a population is immune, the spread of the disease is hindered, thereby protecting those who are not immune. The Reason states herd immunity occurs when a sufficiently large proportion of the population is immune to the disease via vaccination or prior natural exposure. This provides the mechanism by which the indirect protection is achieved, so the Reason properly explains the Assertion.
Option b: If we consider that both statements are true but the Reason is not a correct explanation, this would imply the Reason describes herd immunity but fails to connect it to indirect protection. However, the Reason does connect the concept of a high immune proportion to reduced transmission, which is the essence of indirect protection, so this option mischaracterizes the explanatory link.
Option c: Claiming the Assertion is true but the Reason is false would require that herd immunity protects directly rather than indirectly, or that the Reason contains an incorrect causal link. In reality, the Reason correctly identifies the high-immune-proportion mechanism, so this option is inaccurate.
Option d: If the Assertion were false but the Reason true, we would have a contradiction, since the Reason describes a legitimate mechanism for herd immunity. Therefore, this option cannot hold.
Option e: Saying both statements are false contradicts established understanding of herd immunity and its explanation, making this option incorrect.
In summary, the only option that consistently aligns both statements and the explanatory link is the one that asserts both are true and that the Reason correctly explains the Assertion.

2025-PSB-MIC1IPE(SP-T3-FT) - INFECTIONS, PANDEMICS AND EPIDEMICS

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28. What is herd immunity?

Herd immunity occurs when

When you have a vaccination, who benefits?

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